3763210 - The API "API_BUSINESS_PARTNER" is unable to read the data using Side by Side extensibility by using only Display Catalog

• The API "API_BUSINESS_PARTNER" is not allowing to Read the data via the CB User Id via the Display Catalog "SAP_CMD_BC_BP_DISP_PC"
• It is possible to read/fetch the data via the same CB User using the Maintenance Catalog "SAP_CMD_BC_BP_MAINT_PC"
• The Error encountered when trying to fetch the data via the Display Catalog is "[{\"ContentID\":\"\",\"code\":\"CX_NO_AUTHORIZATION\",\"message\":\"Ei käynnistysoikeutta: API_BUSINESS_PARTNER               0001, palautusarvo 4\",\"propertyref\":\"\",\"severity\":\"error\",\"transition\":false,\"target\":\"\"},{\"ContentID\":\"\",\"code\":\"/IWBEP/CX_MGW_TECH_EXCEPTION\",\"message\":\"User does not have the sufficient authorizations\",\"propertyref\":\"\",\"severity\":\"error\",\"transition\":false,\"target\":\"\"}]}}}"}" 

SAP S/4HANA Cloud Public Edition

1. Sign in with a user that has access to custom side-by-side applications and only display access for Business Partner master data.
2. Start a relevant app that invokes API_BUSINESS_PARTNER.
3. Observe 403/authorization errors indicating missing start or service-group authorizations for the OData service.

• This is as per the SAP Standard Framework design. 
• The BP Display Catalog  doesn’t access to API_BUSINESS_PARTNER while the BP Maintenance Catalog has the required access. That’s why it is not possible to invoke the ODATA API using Maintain catalog but not via Display Catalog. 
• There is no Read Only APIs for the API_BUSINESS_PARTNER.

• This issue can be resolved by assigning the Maintenance Catalog to the CB User which is trying to invoke the API "API_BUSINESS_PARTNER" via the side by side extensibility.
• If the assignment of the Maintenance Catalog is not possible, then they can use C1 released BP CDS (CDS Views for Business Partner) views to only Read the data.

Refer to:

• Side-by-Side Extensibility
• Administrator
• Authorization Model

api_business_partner, api_product, r3tr iwsv, 0001, 403 forbidden, insufficient authorizations, display catalog, maintain catalog, sap_cmd_bc_bp_disp_pc, sap_cmd_bc_bp_maint_pc, sap_cmd_bc_pr_maint_pc, cds c1, read-only, side-by-side, btp, odata, API_BUSINESS_PARTNER, Side - , KBA , LO-MD-BP-2CL , Business Partners for Public Cloud , LO-MD-BP-ODT , OData Service for Business Partner , Problem