Solution : https://service.sap.com/sap/support/notes/733123 (SAP Service marketplace login required)
Key words :
confirmation control key reason, quantity difference profile, purchase document item, attached correction instructions, field ekes-dabmg, ekes-estkz = '4', mrp-relevant, negative quantities, terms leinbf0w, error occurs
Related Notes :
| 646743 | VL34: Inbound delivery becomes MRP-relevant again |