SAP Message AJ124 - Budget billing amount extrapolation cannot be performed

Diagnosis
You wish to perform a consumption-based budget billing amountextrapolation for contract &v1&. However, you have specifiedbackbilling orperiod-end billing in the ratecategory &v2& for the contract, and it is not possible to extrapolate abudget billing plan for a billing schema with backbilling or period-endbilling.

System Response
Processing is terminated.