When using API_ENTERPRISE_PROJECT_SRV following error is raised: Updating project is not possible. Project draft exists for XXXXXX.
SAP S/4HANA Cloud.
Reproducing the Issue
Send a PATCH call to update a project.
When you change a project in Project control app and do not cancel/or save, a draft version is created.
This manual draft version is blocking the edition of this project.
In order to cancel the draft version go to the project in Project control app, click edit and save or click cancel and discard the changes.