SAP Message BP259 - Maximum number of assigned budget subtypes has been exceeded

Diagnosis
You want to assign an additional budget subtype to your FM area, butyou have already assigned the maximum number of subtypes permitted:
If you have activated the additional functions for GermanGovernment customers and you are not using aBudgeting Hierarchy, you can assign a maximumof 30 budget subtypes to the Transfer budget type.
If you have activated the additional functions for GermanGovernment customers and you are working with aBudgeting Hierarchy, you can assign a maximumof 28 budget subtypes to budget types Original Budget andSupplement.

System Response
The additional budget subtypes will not be assigned.