Solution : https://service.sap.com/sap/support/notes/430954 (SAP Service marketplace login required)
Key words : 
solution import check report mbekbean, al0under general/r3server/abap/note, additional key words mmval, clearing invoice values determined, order price unit, invoice currency deviating, internal sap analyses, purchase order history, purchase order currency, invoice values
Related Notes : 
       
| 590609 | Check of material document using report MBCKMDOC | 
| 454464 |