When trying to create a new billing request in Manage project billing you get error:
Creation of the billing document request failed.Billing document request for reference 1000000001 (0000000000) already exists.
SAP S/4HANA Cloud.
Scope item 4E9 is not active in your system.
Please create an incident requesting the activation of scope item 4E9.
new billing solution, project billing , KBA , PS-FIO-BIL , Fiori UI for Project Billing , Problem