Solution : https://service.sap.com/sap/support/notes/1304129 (SAP Service marketplace login required)
Key words :
reading internal table gt_tzb29, relevant support package, check refunds, system issues, system error, fznb reason, program error, solution implement, advance corrections, if_ex_ftr_tr_loan_pp~check_refund
Related Notes :
1553453 | Payment Post Processing: Enhancement of method CHECK_REFUND |
1128858 | NBZ: Method for checking refunds |