Solution : https://service.sap.com/sap/support/notes/1090035 (SAP Service marketplace login required)
Key words : 
prerequisites program error solution preliminary correction, terms rtktz-xbkond reason, base amount fields, interest rate instrument, correction instruction, percentage rate, transaction tm_51, instalment repayment, anuity repayment, condition details
Related Notes : 
       
| 1296745 | IRATE: Error on detail screen of installment repayment |