Solution : https://service.sap.com/sap/support/notes/767333 (SAP Service marketplace login required)
Key words :
customizing activity activate/deactivate funds management, customizing activity maintain field status, assigning fm account assignments, goto -> assignments -> funds management, change account assignment data, derive fm data automatically, maintain field status, fm account assignments, change fm data, external control key
Related Notes :
| 1268001 | FI313 - No funds center entered/derived in item &. |
| 1132989 | Assgt funds mmgmt can be changed despite purchase order |
| 910584 | PM/CS message : Runtime error MESSAGE_TYPE_X |