Solution : https://service.sap.com/sap/support/notes/131676 (SAP Service marketplace login required)
Key words :
page field grp b3 f013 save, required order wbs element cost center, store user-defined assignment/derivation, subfgroup field group descr, billing document line item, actual additional account assignment, field grp mod, required costomzing settings, field group data, billing line item
Related Notes :
| 204495 | |
| 41103 | INFO: CO account assignment logic |