Solution : https://service.sap.com/sap/support/notes/337810 (SAP Service marketplace login required)
Key words :
partial billing document created, long runtimes occur, additional key words, function module sd_downpayment_read, function module rv_accounting_document_create, c_downpay_refresh changing parameter, document item, billing plan, billing rule, 'changing' tab
Related Notes :
| 329276 | Incor. down payment clearing for partly cleared down payment |
| 113347 | Down payment process. as of Release 4.0x (standard) |