Solution : https://service.sap.com/sap/support/notes/674112 (SAP Service marketplace login required)
Key words :
system updates open credit values, open credit values, tmvf-verpn = 'x', vbuk-cmgst = 'b', t459k-bedsd = 'x', schedule line category, tvep-bedsd = 'x', system behavior mentioned, open delivery quantity, function requirement/availability
Related Notes :
1067486 | Incorrect credit value when you increase delivery quantity |
914627 | No open credit value despite confirmed quantity |
806623 | KVsprint 4.x: Update of blocked orders |
393304 | Confirmed quantity not cancelled in spite of block |
377165 | Update open credit values for credit management |