Solution : https://service.sap.com/sap/support/notes/837960 (SAP Service marketplace login required)
Key words :
symptom numeric product ids, billing due list item, numeric product ids, billing engine navigator, /bea/crmb11 reason, dl function group, bd function group, billing item, /bea/crmb01, function modules
Related Notes :
| 630914 | Regenerating individual objects in a BE application |