Solution : https://service.sap.com/sap/support/notes/136089 (SAP Service marketplace login required)
Key words : 
additional key words interest calculation method, solution execute program zdomafix attached, interest calculation method act/act, entered interest calculation method '5', 'interest calculation method' field, error message 'enter valid, enter szbmeth, system generates, target system, generated automatically
Related Notes : 
       
| 109587 | Interest calculation method act/act |