Solution : https://service.sap.com/sap/support/notes/67669 (SAP Service marketplace login required)
Key words : 
additional key words field catalog, invoicing party level, volume-based rebate, field catalog, subsequent settlement, condition tables, customizing tree, menu option, transaction omkb, arrangement
Related Notes : 
       
| 40147 | Collective note: Subsequent settlement (Purch.) Release 3.0 |