Solution : https://service.sap.com/sap/support/notes/185922 (SAP Service marketplace login required)
Key words :
customizing -> field grouping external applications, field grouping menu option, task level menus bupt, external applications isu0001, task level menu, function group xemdca001, set fields delivered, user-defined fields, contract account fields, contract account data
Related Notes :
| 558673 | Contract account fields not in a hideable way in the entry |
| 152498 | Move-in and move-out: Prepopulating fields and checks |