3743470 - PATCH to A_EnterpriseProjectElement returns S4PPM/CRUD/377 error – SAP s/4hana cloud public edition

Updating fields via PATCH on A_EnterpriseProjectElement returns error "Use the Project entity to update the project definition." (/S4PPM/CRUD/377).

SAP S/4HANA Cloud Public Edition

1. Request URI:
   PATCH <host>/sap/opu/odata/sap/API_ENTERPRISE_PROJECT_SRV;v=0002/A_EnterpriseProjectElement(guid'9418820a-c0a9-1ed8-9a92-4bed96f211dd')
2. Payload:
   {
   "ProjectElementDescription":"EPPM TEST updated",
   "PlannedEndDate":"2018-06-11T00:00:00"
   }
3. You get error:
   <code>/S4PPM/CRUD/377</code>
   <message xml:lang="en">Use the Project entity to update the project definition.</message>

The ProjectElementUUID used refers to the project definition (top/root node of the WBS). For enterprise projects, updating the project definition is not supported via A_EnterpriseProjectElement; only read is supported.
As noted in SAP Help Document:
https://help.sap.com/docs/SAP_S4HANA_CLOUD/988903b47d7040f6ac4ec02e44bb58e4/08cf160a75bb49f2ba740650b2e9662e.html?locale=en-US&version=LATEST

Updates to the project definition must be performed via the Project entity (A_EnterpriseProject). The Project Element API supports updates for WBS elements, not for the project header.

If you expect to avoid reading the project definition with the project element entity, you can test to add the filter:
"?$filter=(ParentObjectUUID ne guid'00000000-0000-0000-0000-000000000000')" 

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