Solution : https://service.sap.com/sap/support/notes/39013 (SAP Service marketplace login required)
Key words :
function 'process billing due list', runtime error'sapsql_array_insert_duprec'occurs, additional key words vbfs, order-related billing, source code corrections, billing dates, billing plan, sales orders, prerequisites, requirement
Related Notes :
| 61866 | VF04 : Invoice split due to billing type |