Solution : https://service.sap.com/sap/support/notes/412094 (SAP Service marketplace login required)
Key words :
leading wbs element xxxx determined, leading wbs element projekt_b determined, work breakdown structure element, work breakdown structure elements, additional key words vf01, sales order item, attached advance correction, system-internal numbers, wbs element, internal number
Related Notes :
| 157321 | Order-rel. billing:Check for WBS element is missing |