SAP Message TU257 - Currency of extrapolation doc. (&1) is different to that of BB plan (&2)

Diagnosis Contract &v3& must be allocated to an existing budget billing plan. Theextrapolation document of the contract has a different currency to thatof the existing budget billing plan. INCLUDE ISU_VERARB OBJECT DOKU ID TX Procedure Create a new budget billing plan manually for date &v4&. To do this choose the following in the menu: Utilities Industry ->Invoicing -> Budget Billing Plan -> Create.