Solution : https://service.sap.com/sap/support/notes/422649 (SAP Service marketplace login required)
Key words : 
attached source code corrections, system generally displays, terms subsequent settlement, goto - validity periods, listed rebate arrangements, arrangement maintenance reason, validity periods, rebate arrangements, rebate arrangement, arrangement maintenance
Related Notes : 
       
| 421390 | |
| 183379 | Composite SAP note subsequent settlement (Purchasing) 4.6 | 
| 152725 | Collective note: Subsequent settlement (Purch.) Release 4.5 | 
| 104668 | Collective note: Subsequent settlement (Purch.) Release 4.0 | 
| 40147 | Collective note: Subsequent settlement (Purch.) Release 3.0 |