I am working in S4 Hana addon central procurement hub (sucessor of SRM).
I was looking for an API to create purchase requistions in the CPH. But the OData service I found looks like it is mainly for the backend system. So for example when I try to update an existing PR in the CPH I got the error message that the vendor is not available in the hub. This is correct because in the hub there are no vendors. Only in our backend are the vendors and the hub search helps are looking in the backend. So when I create the PR via FLP in the CPH I can order the PR with a vendor which only exists in the backend. But with the OData API I got the error message.
When I search in api.sap.com for product "central procurement hub" there is not much available...