Solution : https://service.sap.com/sap/support/notes/516053 (SAP Service marketplace login required)
Key words :
activate user exit iwo10027 'user exit, generate user-defined settlement rule', enter default rule 'pmu', choose menu 'table view', start transaction 'sm30', 'work area' field, maintenance view v_tkb2_2, ordaccount assignment type, settlement rule, view 'v_tkb2_2'
Related Notes :
| 1106912 | Settlement rule for asset: Percentage missing |
| 203610 | Customer Exit for Settlement Rule for WBS Element |