Solution : https://service.sap.com/sap/support/notes/546625 (SAP Service marketplace login required)
Key words :
mistakenly touch tab title 'amount split', message amount split term, enter amount split, attached source code, error message f5a060 ', installment payment conditions', split lines, error message, payment installment, warning message
Related Notes :
| 554902 | FB60: Installment payment with amount split |