diff --git a/src/machines/machines.controller.ts b/src/machines/machines.controller.ts
index 4988f4b..60dc435 100644
--- a/src/machines/machines.controller.ts
+++ b/src/machines/machines.controller.ts
@@ -1,6 +1,10 @@
 import { Controller, Get, Post, Body, Patch, Param, Delete } from '@nestjs/common';
 import { MachinesService } from './machines.service';
-import { CreateMachineDto, UpdateMachineDto } from '../shared/dto/machine.dto';
+import {
+  CreateMachineDto,
+  UpdateMachineDto,
+  ReconfigureMachineDto,
+} from '../shared/dto/machine.dto';
 
 @Controller('machines')
 export class MachinesController {
@@ -26,6 +30,14 @@ export class MachinesController {
     return this.machinesService.update(id, updateMachineDto);
   }
 
+  @Patch(':id/skeleton')
+  reconfigure(
+    @Param('id') id: string,
+    @Body() reconfigureMachineDto: ReconfigureMachineDto,
+  ) {
+    return this.machinesService.reconfigure(id, reconfigureMachineDto);
+  }
+
   @Delete(':id')
   remove(@Param('id') id: string) {
     return this.machinesService.remove(id);
diff --git a/src/machines/machines.service.ts b/src/machines/machines.service.ts
index 5ea07c6..5cd4262 100644
--- a/src/machines/machines.service.ts
+++ b/src/machines/machines.service.ts
@@ -1,53 +1,125 @@
 import { Injectable } from '@nestjs/common';
 import { PrismaService } from '../prisma/prisma.service';
-import { 
-  CreateMachineDto, 
+import {
+  CreateMachineDto,
   UpdateMachineDto,
+  ReconfigureMachineDto,
   MachineComponentSelectionDto,
-  MachinePieceSelectionDto
+  MachinePieceSelectionDto,
 } from '../shared/dto/machine.dto';
 
+const TYPE_MACHINE_CONFIGURATION_INCLUDE = {
+  customFields: true,
+  componentRequirements: {
+    include: {
+      typeComposant: true,
+    },
+  },
+  pieceRequirements: {
+    include: {
+      typePiece: true,
+    },
+  },
+};
+
+const MACHINE_DEFAULT_INCLUDE = {
+  site: true,
+  typeMachine: {
+    include: TYPE_MACHINE_CONFIGURATION_INCLUDE,
+  },
+  constructeur: true,
+  composants: {
+    include: {
+      typeComposant: true,
+      composantModel: true,
+      typeMachineComponentRequirement: {
+        include: {
+          typeComposant: true,
+        },
+      },
+      sousComposants: true,
+      customFieldValues: {
+        include: {
+          customField: true,
+        },
+      },
+      constructeur: true,
+      pieces: {
+        include: {
+          customFieldValues: {
+            include: {
+              customField: true,
+            },
+          },
+          constructeur: true,
+          pieceModel: true,
+          typeMachinePieceRequirement: {
+            include: {
+              typePiece: true,
+            },
+          },
+        },
+      },
+    },
+  },
+  pieces: {
+    include: {
+      customFieldValues: {
+        include: {
+          customField: true,
+        },
+      },
+      constructeur: true,
+      pieceModel: true,
+      typeMachinePieceRequirement: {
+        include: {
+          typePiece: true,
+        },
+      },
+    },
+  },
+  customFieldValues: {
+    include: {
+      customField: true,
+    },
+  },
+  documents: true,
+};
+
 @Injectable()
 export class MachinesService {
   constructor(private prisma: PrismaService) {}
 
-  async create(createMachineDto: CreateMachineDto) {
-    const {
-      componentSelections = [],
-      pieceSelections = [],
-      ...machineData
-    } = createMachineDto;
-
-    if (!machineData.typeMachineId) {
-      throw new Error('typeMachineId est requis pour créer une machine à partir d\'un squelette.');
-    }
-
+  private async getTypeMachineConfiguration(typeMachineId: string) {
     const typeMachine = await this.prisma.typeMachine.findUnique({
-      where: { id: machineData.typeMachineId },
-      include: {
-        customFields: true,
-        componentRequirements: {
-          include: {
-            typeComposant: true,
-          },
-        },
-        pieceRequirements: {
-          include: {
-            typePiece: true,
-          },
-        },
-      },
+      where: { id: typeMachineId },
+      include: TYPE_MACHINE_CONFIGURATION_INCLUDE,
     });
 
     if (!typeMachine) {
       throw new Error('Type de machine non trouvé');
     }
 
+    return typeMachine;
+  }
+
+  private async buildConfigurationContext(
+    typeMachine: any,
+    componentSelections: MachineComponentSelectionDto[],
+    pieceSelections: MachinePieceSelectionDto[],
+  ) {
+    const componentRequirements = (Array.isArray(typeMachine.componentRequirements)
+      ? typeMachine.componentRequirements
+      : []) as any[];
+    const pieceRequirements = (Array.isArray(typeMachine.pieceRequirements)
+      ? typeMachine.pieceRequirements
+      : []) as any[];
+
     const componentRequirementMap = new Map(
-      typeMachine.componentRequirements.map((requirement) => [requirement.id, requirement]),
+      componentRequirements.map((requirement: any) => [requirement.id, requirement]),
     );
     const pieceRequirementMap = new Map(
-      typeMachine.pieceRequirements.map((requirement) => [requirement.id, requirement]),
+      pieceRequirements.map((requirement: any) => [requirement.id, requirement]),
     );
 
     const componentSelectionMap = new Map<string, MachineComponentSelectionDto[]>();
@@ -94,7 +166,7 @@ export class MachinesService {
       : [];
     const pieceModelMap = new Map(pieceModels.map((model) => [model.id, model]));
 
-    for (const requirement of typeMachine.componentRequirements) {
+    for (const requirement of componentRequirements) {
       const selections = componentSelectionMap.get(requirement.id) ?? [];
       const min = requirement.minCount ?? (requirement.required ? 1 : 0);
       const max = requirement.maxCount ?? undefined;
@@ -121,7 +193,7 @@ export class MachinesService {
       }
     }
 
-    for (const requirement of typeMachine.pieceRequirements) {
+    for (const requirement of pieceRequirements) {
       const selections = pieceSelectionMap.get(requirement.id) ?? [];
       const min = requirement.minCount ?? (requirement.required ? 1 : 0);
       const max = requirement.maxCount ?? undefined;
@@ -186,7 +258,42 @@ export class MachinesService {
       }
     }
 
-    return await this.prisma.$transaction(async (prisma) => {
+    return {
+      componentSelectionMap,
+      pieceSelectionMap,
+      componentModelMap,
+      pieceModelMap,
+    };
+  }
+
+  async create(createMachineDto: CreateMachineDto) {
+    const {
+      componentSelections = [],
+      pieceSelections = [],
+      ...machineData
+    } = createMachineDto;
+
+    if (!machineData.typeMachineId) {
+      throw new Error('typeMachineId est requis pour créer une machine à partir d\'un squelette.');
+    }
+
+    const typeMachine = await this.getTypeMachineConfiguration(machineData.typeMachineId);
+
+    const {
+      componentSelectionMap,
+      pieceSelectionMap,
+      componentModelMap,
+      pieceModelMap,
+    } = await this.buildConfigurationContext(typeMachine, componentSelections, pieceSelections);
+
+    const componentRequirements = (Array.isArray(typeMachine.componentRequirements)
+      ? typeMachine.componentRequirements
+      : []) as any[];
+    const pieceRequirements = (Array.isArray(typeMachine.pieceRequirements)
+      ? typeMachine.pieceRequirements
+      : []) as any[];
+
+    return this.prisma.$transaction(async (prisma) => {
       const machine = await prisma.machine.create({
         data: machineData,
         include: {
@@ -196,8 +303,8 @@ export class MachinesService {
         },
       });
 
-      if (typeMachine.componentRequirements.length > 0) {
-        for (const requirement of typeMachine.componentRequirements) {
+      if (componentRequirements.length > 0) {
+        for (const requirement of componentRequirements) {
           const selections = componentSelectionMap.get(requirement.id) ?? [];
           for (const selection of selections) {
             const model = selection.componentModelId ? componentModelMap.get(selection.componentModelId) : undefined;
@@ -212,8 +319,8 @@ export class MachinesService {
         }
       }
 
-      if (typeMachine.pieceRequirements.length > 0) {
-        for (const requirement of typeMachine.pieceRequirements) {
+      if (pieceRequirements.length > 0) {
+        for (const requirement of pieceRequirements) {
           const selections = pieceSelectionMap.get(requirement.id) ?? [];
           for (const selection of selections) {
             const model = selection.pieceModelId ? pieceModelMap.get(selection.pieceModelId) : undefined;
@@ -234,76 +341,7 @@ export class MachinesService {
 
       return prisma.machine.findUnique({
         where: { id: machine.id },
-        include: {
-          site: true,
-          typeMachine: {
-            include: {
-              customFields: true,
-              componentRequirements: {
-                include: {
-                  typeComposant: true,
-                },
-              },
-              pieceRequirements: {
-                include: {
-                  typePiece: true,
-                },
-              },
-            },
-          },
-          constructeur: true,
-          composants: {
-            include: {
-              typeComposant: true,
-              composantModel: true,
-              typeMachineComponentRequirement: {
-                include: {
-                  typeComposant: true,
-                },
-              },
-              sousComposants: true,
-              pieces: {
-                include: {
-                  customFieldValues: {
-                    include: {
-                      customField: true,
-                    },
-                  },
-                  constructeur: true,
-                  pieceModel: true,
-                  typeMachinePieceRequirement: {
-                    include: {
-                      typePiece: true,
-                    },
-                  },
-                },
-              },
-              constructeur: true,
-            },
-          },
-          pieces: {
-            include: {
-              customFieldValues: {
-                include: {
-                  customField: true,
-                },
-              },
-              constructeur: true,
-              pieceModel: true,
-              typeMachinePieceRequirement: {
-                include: {
-                  typePiece: true,
-                },
-              },
-            },
-          },
-          customFieldValues: {
-            include: {
-              customField: true,
-            },
-          },
-          documents: true,
-        },
+        include: MACHINE_DEFAULT_INCLUDE,
       });
     });
   }
@@ -660,239 +698,146 @@ export class MachinesService {
 
   async findAll() {
     return this.prisma.machine.findMany({
-      include: {
-        site: true,
-        typeMachine: {
-          include: {
-            customFields: true,
-            componentRequirements: {
-              include: {
-                typeComposant: true,
-              },
-            },
-            pieceRequirements: {
-              include: {
-                typePiece: true,
-              },
-            },
-          },
-        },
-        constructeur: true,
-        composants: {
-          include: {
-            typeComposant: true,
-            composantModel: true,
-            typeMachineComponentRequirement: {
-              include: {
-                typeComposant: true,
-              },
-            },
-            sousComposants: true,
-            customFieldValues: {
-              include: {
-                customField: true,
-              },
-            },
-            constructeur: true,
-            pieces: {
-              include: {
-                customFieldValues: {
-                  include: {
-                    customField: true,
-                  },
-                },
-                constructeur: true,
-                pieceModel: true,
-                typeMachinePieceRequirement: {
-                  include: {
-                    typePiece: true,
-                  },
-                },
-              },
-            },
-          },
-        },
-        pieces: {
-          include: {
-            customFieldValues: {
-              include: {
-                customField: true,
-              },
-            },
-            constructeur: true,
-            pieceModel: true,
-            typeMachinePieceRequirement: {
-              include: {
-                typePiece: true,
-              },
-            },
-          },
-        },
-        customFieldValues: {
-          include: {
-            customField: true,
-          },
-        },
-        documents: true,
-      },
+      include: MACHINE_DEFAULT_INCLUDE,
     });
   }
 
   async findOne(id: string) {
     return this.prisma.machine.findUnique({
+      where: { id },
+      include: MACHINE_DEFAULT_INCLUDE,
+    });
+  }
+
+  async reconfigure(id: string, reconfigureMachineDto: ReconfigureMachineDto) {
+    const {
+      componentSelections = [],
+      pieceSelections = [],
+    } = reconfigureMachineDto;
+
+    const machine = await this.prisma.machine.findUnique({
       where: { id },
       include: {
-        site: true,
         typeMachine: {
-          include: {
-            customFields: true,
-            componentRequirements: {
-              include: {
-                typeComposant: true,
-              },
-            },
-            pieceRequirements: {
-              include: {
-                typePiece: true,
-              },
-            },
-          },
+          include: TYPE_MACHINE_CONFIGURATION_INCLUDE,
         },
-        constructeur: true,
-        composants: {
-          include: {
-            typeComposant: true,
-            composantModel: true,
-            typeMachineComponentRequirement: {
-              include: {
-                typeComposant: true,
-              },
-            },
-            sousComposants: true,
-            customFieldValues: {
-              include: {
-                customField: true,
-              },
-            },
-            constructeur: true,
-            pieces: {
-              include: {
-                customFieldValues: {
-                  include: {
-                    customField: true,
-                  },
-                },
-                constructeur: true,
-                pieceModel: true,
-                typeMachinePieceRequirement: {
-                  include: {
-                    typePiece: true,
-                  },
-                },
-              },
-            },
-          },
-        },
-        pieces: {
-          include: {
-            customFieldValues: {
-              include: {
-                customField: true,
-              },
-            },
-            constructeur: true,
-            pieceModel: true,
-            typeMachinePieceRequirement: {
-              include: {
-                typePiece: true,
-              },
-            },
-          },
-        },
-        customFieldValues: {
-          include: {
-            customField: true,
-          },
-        },
-        documents: true,
       },
     });
+
+    if (!machine) {
+      throw new Error('Machine non trouvée');
+    }
+
+    if (!machine.typeMachineId || !machine.typeMachine) {
+      throw new Error('Impossible de reconfigurer une machine sans type de machine associé.');
+    }
+
+    const typeMachine = machine.typeMachine;
+
+    const {
+      componentSelectionMap,
+      pieceSelectionMap,
+      componentModelMap,
+      pieceModelMap,
+    } = await this.buildConfigurationContext(typeMachine, componentSelections, pieceSelections);
+
+    const componentRequirements = (Array.isArray(typeMachine.componentRequirements)
+      ? typeMachine.componentRequirements
+      : []) as any[];
+    const pieceRequirements = (Array.isArray(typeMachine.pieceRequirements)
+      ? typeMachine.pieceRequirements
+      : []) as any[];
+
+    return this.prisma.$transaction(async (prisma) => {
+      await prisma.customFieldValue.deleteMany({
+        where: {
+          OR: [
+            {
+              composant: {
+                machineId: id,
+                typeMachineComponentRequirementId: { not: null },
+              },
+            },
+            {
+              piece: {
+                machineId: id,
+                typeMachinePieceRequirementId: { not: null },
+              },
+            },
+            {
+              piece: {
+                composant: {
+                  machineId: id,
+                  typeMachineComponentRequirementId: { not: null },
+                },
+              },
+            },
+          ],
+        },
+      });
+
+      await prisma.piece.deleteMany({
+        where: {
+          machineId: id,
+          typeMachinePieceRequirementId: { not: null },
+        },
+      });
+
+      await prisma.composant.deleteMany({
+        where: {
+          machineId: id,
+          typeMachineComponentRequirementId: { not: null },
+        },
+      });
+
+      if (componentRequirements.length > 0) {
+        for (const requirement of componentRequirements) {
+          const selections = componentSelectionMap.get(requirement.id) ?? [];
+          for (const selection of selections) {
+            const model = selection.componentModelId
+              ? componentModelMap.get(selection.componentModelId)
+              : undefined;
+            const definition = this.normalizeComponentSelection(selection, requirement, model);
+            await this.createComponentsFromType(prisma, id, [definition]);
+          }
+        }
+      } else {
+        const legacyComponents = (typeMachine as any).components;
+        if (legacyComponents) {
+          await this.createComponentsFromType(prisma, id, legacyComponents);
+        }
+      }
+
+      if (pieceRequirements.length > 0) {
+        for (const requirement of pieceRequirements) {
+          const selections = pieceSelectionMap.get(requirement.id) ?? [];
+          for (const selection of selections) {
+            const model = selection.pieceModelId
+              ? pieceModelMap.get(selection.pieceModelId)
+              : undefined;
+            const definition = this.normalizePieceSelection(selection, requirement, model);
+            await this.createMachinePiecesFromType(prisma, id, [definition]);
+          }
+        }
+      } else {
+        const legacyPieces = (typeMachine as any).machinePieces;
+        if (legacyPieces) {
+          await this.createMachinePiecesFromType(prisma, id, legacyPieces);
+        }
+      }
+
+      return prisma.machine.findUnique({
+        where: { id },
+        include: MACHINE_DEFAULT_INCLUDE,
+      });
+    });
   }
 
   async update(id: string, updateMachineDto: UpdateMachineDto) {
     return this.prisma.machine.update({
       where: { id },
       data: updateMachineDto,
-      include: {
-        site: true,
-        typeMachine: {
-          include: {
-            customFields: true,
-            componentRequirements: {
-              include: {
-                typeComposant: true,
-              },
-            },
-            pieceRequirements: {
-              include: {
-                typePiece: true,
-              },
-            },
-          },
-        },
-        constructeur: true,
-        composants: {
-          include: {
-            typeComposant: true,
-            composantModel: true,
-            typeMachineComponentRequirement: {
-              include: {
-                typeComposant: true,
-              },
-            },
-            sousComposants: true,
-            constructeur: true,
-            pieces: {
-              include: {
-                constructeur: true,
-                pieceModel: true,
-                typeMachinePieceRequirement: {
-                  include: {
-                    typePiece: true,
-                  },
-                },
-                customFieldValues: {
-                  include: {
-                    customField: true,
-                  },
-                },
-              },
-            },
-          },
-        },
-        pieces: {
-          include: {
-            constructeur: true,
-            pieceModel: true,
-            typeMachinePieceRequirement: {
-              include: {
-                typePiece: true,
-              },
-            },
-            customFieldValues: {
-              include: {
-                customField: true,
-              },
-            },
-          },
-        },
-        customFieldValues: {
-          include: {
-            customField: true,
-          },
-        },
-        documents: true,
-      },
+      include: MACHINE_DEFAULT_INCLUDE,
     });
   }
 
diff --git a/src/shared/dto/machine.dto.ts b/src/shared/dto/machine.dto.ts
index 01f2168..a798000 100644
--- a/src/shared/dto/machine.dto.ts
+++ b/src/shared/dto/machine.dto.ts
@@ -90,4 +90,18 @@ export class UpdateMachineDto {
   @IsOptional()
   @IsString()
   typeMachineId?: string;
-} 
+}
+
+export class ReconfigureMachineDto {
+  @IsOptional()
+  @IsArray()
+  @ValidateNested({ each: true })
+  @Type(() => MachineComponentSelectionDto)
+  componentSelections?: MachineComponentSelectionDto[];
+
+  @IsOptional()
+  @IsArray()
+  @ValidateNested({ each: true })
+  @Type(() => MachinePieceSelectionDto)
+  pieceSelections?: MachinePieceSelectionDto[];
+}
diff --git a/test/app.e2e-spec.ts b/test/app.e2e-spec.ts
index 4df6580..c20dbd2 100644
--- a/test/app.e2e-spec.ts
+++ b/test/app.e2e-spec.ts
@@ -3,17 +3,31 @@ import { INestApplication } from '@nestjs/common';
 import * as request from 'supertest';
 import { App } from 'supertest/types';
 import { AppModule } from './../src/app.module';
+import { PrismaService } from '../src/prisma/prisma.service';
 
 describe('AppController (e2e)', () => {
   let app: INestApplication<App>;
+  let prisma: PrismaService;
 
-  beforeEach(async () => {
+  beforeAll(async () => {
     const moduleFixture: TestingModule = await Test.createTestingModule({
       imports: [AppModule],
     }).compile();
 
     app = moduleFixture.createNestApplication();
     await app.init();
+
+    prisma = app.get(PrismaService);
+  });
+
+  afterAll(async () => {
+    await app.close();
+  });
+
+  beforeEach(async () => {
+    await prisma.$executeRawUnsafe(
+      'TRUNCATE TABLE custom_field_values, documents, pieces, composants, machines, composant_models, piece_models, type_machine_component_requirements, type_machine_piece_requirements, custom_fields, type_machines, type_composants, type_pieces, constructeurs, sites RESTART IDENTITY CASCADE',
+    );
   });
 
   it('/ (GET)', () => {
@@ -22,4 +36,256 @@ describe('AppController (e2e)', () => {
       .expect(200)
       .expect('Hello World!');
   });
+
+  describe('Machines skeleton reconfiguration', () => {
+    it('reconfigures machine skeleton according to updated requirements', async () => {
+      const site = await prisma.site.create({
+        data: {
+          name: 'Site principal',
+          contactName: 'Jane Doe',
+          contactPhone: '0102030405',
+          contactAddress: '1 rue Principale',
+          contactPostalCode: '75000',
+          contactCity: 'Paris',
+        },
+      });
+
+      const typeComposant = await prisma.typeComposant.create({
+        data: {
+          name: 'Module',
+          description: 'Module principal',
+        },
+      });
+
+      await prisma.customField.create({
+        data: {
+          name: 'Serial',
+          type: 'text',
+          required: false,
+          options: [],
+          typeComposantId: typeComposant.id,
+        },
+      });
+
+      const typePiece = await prisma.typePiece.create({
+        data: {
+          name: 'Pièce de rechange',
+          description: 'Pièce critique',
+        },
+      });
+
+      await prisma.customField.create({
+        data: {
+          name: 'Batch',
+          type: 'text',
+          required: false,
+          options: [],
+          typePieceId: typePiece.id,
+        },
+      });
+
+      const componentModelV1 = await prisma.composantModel.create({
+        data: {
+          name: 'Module V1',
+          typeComposantId: typeComposant.id,
+          structure: {
+            name: 'Module V1',
+            customFields: [{ name: 'Serial', defaultValue: 'SERIAL-V1' }],
+          },
+        },
+      });
+
+      const componentModelV2 = await prisma.composantModel.create({
+        data: {
+          name: 'Module V2',
+          typeComposantId: typeComposant.id,
+          structure: {
+            name: 'Module V2',
+            customFields: [{ name: 'Serial', defaultValue: 'SERIAL-V2' }],
+          },
+        },
+      });
+
+      const pieceModelV1 = await prisma.pieceModel.create({
+        data: {
+          name: 'Pièce V1',
+          typePieceId: typePiece.id,
+          structure: {
+            name: 'Pièce V1',
+            customFields: [{ name: 'Batch', defaultValue: 'BATCH-V1' }],
+          },
+        },
+      });
+
+      const pieceModelV2 = await prisma.pieceModel.create({
+        data: {
+          name: 'Pièce V2',
+          typePieceId: typePiece.id,
+          structure: {
+            name: 'Pièce V2',
+            customFields: [{ name: 'Batch', defaultValue: 'BATCH-V2' }],
+          },
+        },
+      });
+
+      const typeMachine = await prisma.typeMachine.create({
+        data: {
+          name: 'Type Machine A',
+          componentRequirements: {
+            create: [
+              {
+                label: 'Module initial',
+                minCount: 1,
+                maxCount: 1,
+                required: true,
+                allowNewModels: false,
+                typeComposantId: typeComposant.id,
+              },
+            ],
+          },
+          pieceRequirements: {
+            create: [
+              {
+                label: 'Pièce initiale',
+                minCount: 1,
+                maxCount: 1,
+                required: true,
+                allowNewModels: false,
+                typePieceId: typePiece.id,
+              },
+            ],
+          },
+        },
+        include: {
+          componentRequirements: true,
+          pieceRequirements: true,
+        },
+      });
+
+      const initialComponentRequirement = typeMachine.componentRequirements[0];
+      const initialPieceRequirement = typeMachine.pieceRequirements[0];
+
+      const createResponse = await request(app.getHttpServer())
+        .post('/machines')
+        .send({
+          name: 'Machine Alpha',
+          siteId: site.id,
+          typeMachineId: typeMachine.id,
+          componentSelections: [
+            {
+              requirementId: initialComponentRequirement.id,
+              componentModelId: componentModelV1.id,
+            },
+          ],
+          pieceSelections: [
+            {
+              requirementId: initialPieceRequirement.id,
+              pieceModelId: pieceModelV1.id,
+            },
+          ],
+        })
+        .expect(201);
+
+      const machineId = createResponse.body.id as string;
+
+      const initialComponents = await prisma.composant.findMany({ where: { machineId } });
+      expect(initialComponents).toHaveLength(1);
+      const initialComponentId = initialComponents[0].id;
+
+      const initialPieces = await prisma.piece.findMany({ where: { machineId } });
+      expect(initialPieces).toHaveLength(1);
+      const initialPieceId = initialPieces[0].id;
+
+      expect(
+        await prisma.customFieldValue.count({ where: { composantId: initialComponentId } }),
+      ).toBe(1);
+      expect(await prisma.customFieldValue.count({ where: { pieceId: initialPieceId } })).toBe(1);
+
+      await prisma.typeMachineComponentRequirement.deleteMany({
+        where: { typeMachineId: typeMachine.id },
+      });
+      await prisma.typeMachinePieceRequirement.deleteMany({
+        where: { typeMachineId: typeMachine.id },
+      });
+
+      const newComponentRequirement = await prisma.typeMachineComponentRequirement.create({
+        data: {
+          label: 'Modules mis à jour',
+          minCount: 2,
+          maxCount: 2,
+          required: true,
+          allowNewModels: true,
+          typeMachineId: typeMachine.id,
+          typeComposantId: typeComposant.id,
+        },
+      });
+
+      const newPieceRequirement = await prisma.typeMachinePieceRequirement.create({
+        data: {
+          label: 'Pièce mise à jour',
+          minCount: 1,
+          maxCount: 1,
+          required: true,
+          allowNewModels: false,
+          typeMachineId: typeMachine.id,
+          typePieceId: typePiece.id,
+        },
+      });
+
+      const reconfigureResponse = await request(app.getHttpServer())
+        .patch(`/machines/${machineId}/skeleton`)
+        .send({
+          componentSelections: [
+            {
+              requirementId: newComponentRequirement.id,
+              componentModelId: componentModelV2.id,
+            },
+            {
+              requirementId: newComponentRequirement.id,
+              definition: {
+                name: 'Module personnalisé',
+                customFields: [{ name: 'Serial', defaultValue: 'SERIAL-CUSTOM' }],
+              },
+            },
+          ],
+          pieceSelections: [
+            {
+              requirementId: newPieceRequirement.id,
+              pieceModelId: pieceModelV2.id,
+            },
+          ],
+        })
+        .expect(200);
+
+      expect(reconfigureResponse.body.composants).toHaveLength(2);
+      expect(reconfigureResponse.body.pieces).toHaveLength(1);
+
+      const componentsAfter = await prisma.composant.findMany({ where: { machineId } });
+      expect(componentsAfter).toHaveLength(2);
+      const componentIdsAfter = componentsAfter.map((component) => component.id);
+      expect(componentIdsAfter).not.toContain(initialComponentId);
+      componentsAfter.forEach((component) => {
+        expect(component.typeMachineComponentRequirementId).toBe(newComponentRequirement.id);
+      });
+
+      const componentValueCount = await prisma.customFieldValue.count({
+        where: { composantId: { in: componentIdsAfter } },
+      });
+      expect(componentValueCount).toBe(2);
+      expect(
+        await prisma.customFieldValue.count({ where: { composantId: initialComponentId } }),
+      ).toBe(0);
+
+      const piecesAfter = await prisma.piece.findMany({ where: { machineId } });
+      expect(piecesAfter).toHaveLength(1);
+      const [updatedPiece] = piecesAfter;
+      expect(updatedPiece.typeMachinePieceRequirementId).toBe(newPieceRequirement.id);
+      expect(updatedPiece.id).not.toBe(initialPieceId);
+
+      expect(
+        await prisma.customFieldValue.count({ where: { pieceId: updatedPiece.id } }),
+      ).toBe(1);
+      expect(await prisma.customFieldValue.count({ where: { pieceId: initialPieceId } })).toBe(0);
+    });
+  });
 });