> ## Documentation Index > Fetch the complete documentation index at: https://docs.realtimelca.com/llms.txt > Use this file to discover all available pages before exploring further. # Patch EPD > Partially updates one or more materials in the EPD (Environmental Product Declaration) database. Only the fields specified in `updateFieldPaths` will be modified — all other fields on the material records remain unchanged. ## OpenAPI ````yaml /api-reference/realtime-lca-openapi.yaml patch /material openapi: 3.0.0 info: title: Real-Time LCA REST Documentation version: 1.0.0 description: >- ### Description 📝 This collection contains a set of REST API requests for the Real-Time LCA (Life Cycle Assessment) service. ### Authenticate user 👤🔑 In the `Auth` folder there's a `POST` request for authenticating the user. In this request body you can type in the user RTLCA user credentials (username & password) and a succesfull (`200 OK`) response will set the collection `BearerToken` variable which is then inherited by all other requests. servers: - url: https://api.realtimelca.com/rest/api description: REST API. - url: https://api.realtimelca.com/epd/api description: EPD API. - url: https://auth.realtimelca.com/frontegg/identity/resources/auth/v1 description: Authentication API (Frontegg identity v1). - url: https://realtimelca-prod.hasura.app description: GraphQL API (Hasura). security: - BearerAuth: [] tags: - name: Auth - name: User - name: Overview - name: Project - name: Dashboard - name: Mapping - name: Automapping - name: Transport - name: Waste - name: Inspect - name: Report - name: Images - name: Library - name: Datasource - name: Owner - name: Material - name: Constructions - name: Enums paths: /material: servers: - url: https://api.realtimelca.com/epd/api patch: tags: - Library - Material summary: Patch EPD description: >- Partially updates one or more materials in the EPD (Environmental Product Declaration) database. Only the fields specified in `updateFieldPaths` will be modified — all other fields on the material records remain unchanged. requestBody: content: application/json: schema: type: object properties: updateFieldPaths: type: array items: type: string materials: type: array items: type: object properties: internalId: type: string internalVersionNumber: type: integer tenantId: type: string format: utc-millisec isPublic: type: boolean isCustom: type: boolean isConstruction: type: boolean tags: type: array items: type: string lciaResultCompleteness: type: integer basedOnMaterialIds: type: array items: {} epdInfo: type: object properties: epdSpecificationForm: type: integer epdProductIndustryType: type: integer validTo: type: string format: style epdVersion: type: string format: utc-millisec publicationDate: type: string fileEntityId: type: string declarationOwnerId: type: string datasourceId: type: string declarationNumber: type: string link: type: string format: uri lciaResults: type: array items: type: object properties: moduleTypeEnum: type: integer moduleStatusEnum: type: integer indicators: type: array items: type: object properties: type: type: integer unit: type: string originalIdentifier: type: string value: type: number declaredUnit: type: object properties: declaredValue: type: integer declaredUnit: type: integer mass: type: integer massUnit: type: integer expectedLifespan: type: integer name: type: string description: type: string format: style datasourceName: type: string declarationOwnerName: type: string newestVersion: type: boolean id: type: string createdAt: type: string format: date-time example: updateFieldPaths: - DeclaredUnit.Mass - DeclaredUnit.MassUnit materials: - internalId: c3cc340f-01ad-4149-9d7b-111ea48700be internalVersionNumber: 1 tenantId: '2' isPublic: true isCustom: false isConstruction: false tags: - Zink lciaResultCompleteness: 1 basedOnMaterialIds: [] epdInfo: epdSpecificationForm: 0 epdProductIndustryType: 2 validTo: '2023-01-01T00:00:00.0000000' epdVersion: '1.0' publicationDate: '2022-05-22T00:00:00.0000000' fileEntityId: 00000000-0000-0000-0000-000000000000 declarationOwnerId: 00000000-0000-0000-0000-000000000000 datasourceId: cf1bca75-0e00-40f1-8666-a72e6b501e07 declarationNumber: '' link: https://www.retsinformation.dk/eli/lta/2022/1464 lciaResults: - moduleTypeEnum: 0 moduleStatusEnum: 2 indicators: - type: 0 unit: '' originalIdentifier: gwp value: 2.09 - moduleTypeEnum: 15 moduleStatusEnum: 2 indicators: - type: 0 unit: '' originalIdentifier: gwp value: 0 - moduleTypeEnum: 16 moduleStatusEnum: 2 indicators: - type: 0 unit: '' originalIdentifier: gwp value: 0.00068207 - moduleTypeEnum: 17 moduleStatusEnum: 2 indicators: - type: 0 unit: '' originalIdentifier: gwp value: -1.81062 - moduleTypeEnum: 1 moduleStatusEnum: 1 indicators: [] - moduleTypeEnum: 2 moduleStatusEnum: 1 indicators: [] - moduleTypeEnum: 3 moduleStatusEnum: 1 indicators: [] - moduleTypeEnum: 4 moduleStatusEnum: 1 indicators: [] - moduleTypeEnum: 5 moduleStatusEnum: 1 indicators: [] - moduleTypeEnum: 6 moduleStatusEnum: 1 indicators: [] - moduleTypeEnum: 7 moduleStatusEnum: 1 indicators: [] - moduleTypeEnum: 8 moduleStatusEnum: 1 indicators: [] - moduleTypeEnum: 9 moduleStatusEnum: 1 indicators: [] - moduleTypeEnum: 10 moduleStatusEnum: 1 indicators: [] - moduleTypeEnum: 11 moduleStatusEnum: 1 indicators: [] - moduleTypeEnum: 12 moduleStatusEnum: 1 indicators: [] - moduleTypeEnum: 13 moduleStatusEnum: 1 indicators: [] - moduleTypeEnum: 14 moduleStatusEnum: 1 indicators: [] declaredUnit: declaredUnit: 1 declaredValue: 1 mass: 7200 massUnit: 2 expectedLifespan: 0 name: Zink, patineret description: >- Generic environmental data published in the Danish Building Code January 2023 - Tabel 7, with the following ID: #G0015 datasourceName: Tabel7 declarationOwnerName: Tabel 7 newestVersion: true id: 0e62c058-a6e0-4c25-a1eb-13647aef66c5 createdAt: '2023-04-19T12:05:40.0244540+02:00' responses: default: description: Response schema not yet documented in the upstream Postman spec. components: securitySchemes: BearerAuth: type: http scheme: bearer ````