SAP Message BP383 - Function not allowed - budget structure being generated

Diagnosis
You are working with a funds center in the budget plan. The manualmaintenance of the budget structure is therefore not possible in thisprogram.

System Response
Processing cancelled.

Procedure
To maintain the budget structure, use one of the following programs:
You can call all three programs from the SAP menu, by choosing Accounting -> Financial Accounting -> Funds Management -> Master Data-> Additional Functions German Government -> Budget Structure ->Generate Budget Objects followed by:
-> Budget or
-> Collective Expenditure or
-> Net Voting