Solution : https://service.sap.com/sap/support/notes/549330 (SAP Service marketplace login required)
Summary : 
      When creating a subcontract order in SAP for a vendor with multiple quota arrangements and differing production versions, the system fails to select the quota-specified production version. For instance, despite production version 0001 having a 100% quota allocation, the system defaults to version 0002 due to its positioning as the first production version encountered. This issue arises from a limitation within the SAP purchasing function, which does not dynamically select production versions during quota arrangements, thus neglecting allocated quantities.
Key words : 
correspondingly valid bom, vendor    pver   quota, quota arrangement period, quota arrangement, bom explosion, quota arrangements, production versions, subcontract order, production version, %     allocated quantity 1
Related Notes : 
       
| 458606 | FAQ: Subcontracting in purchasing |