Solution : https://service.sap.com/sap/support/notes/49528 (SAP Service marketplace login required)
Key words : 
additional key words itemization, current condition record, volume-based rebate, period-specific conditions, correct period conditions, invoice receipt exists, solution program error, invoice verification document, invoice receipt, validity period
Related Notes : 
       
| 49575 | Subsequent settlement itemization error MN I 355 | 
| 49067 | Update Vol. business done with vendor Conversn prob | 
| 40147 | Collective note: Subsequent settlement (Purch.) Release 3.0 |