SAP Message 56797 - Expense type &1 cannot be changed to expense type &2

Diagnosis You are trying to change expense type &v1& for a credit card receipt.Your system administrators have set the expense type you have chosen ( V2) as not being allowed for this credit card transaction. System Response The system does not allow these changes. The original expense type willbe restored. Procedure Choose an expense type that is allowed for this type of credit cardtransaction.