Solution : https://service.sap.com/sap/support/notes/306151 (SAP Service marketplace login required)
Key words :
attached source code, material master record, payments exceeds net, milestone billing documents, valid billing date, milestone billing date, payment item reason, billing plan belongs, milestone billing document, payment clearing item
Related Notes :
| 528608 | Sales document with 'pure' down payment items (new) |
| 378726 | No clearing of pure down payment item |
| 368599 | Incorrect clearing of down payments |
| 367797 | Incorrect clearing of down payments fr Release 3.1 |
| 361830 | Partially billed items can be rejected |
| 350993 | Down payments from Release 3.x are not cleared |
| 113347 | Down payment process. as of Release 4.0x (standard) |