Assembly Scrap in Purchase Order

Hi,

In MRP 1 View for a material we maintained Assembly Scrap as 10%.

For this Setting in,

1. Planned Order :  As a result of MRP run, we will get a proposal for 110 nos with a breakup of 10 nos (10%) in Scrap Qty, which we can convert to Production Order or PR.

2. Production Order in CO01: if we enter a Production Order Qty says 100 nos , then the system will automatically propose a new values as 110 nos with a breakup of 10 nos (10%) in Scrap Qty.

My Requirement is,

While Create a Manual Subcontracting Purchase Order in ME21N, the System should behave as in CO01. That is, if we enter a Purchase Order Qty (Req. Qty) as 100 nos , then the system should automatically propose a new values as 110 nos in PO by considering breakup of 10 nos (10%) in Scrap Qty. We are not using MRP Run, only manual PO without PR is been  used.

Note : Subcontracting PO is created directly without Production Order (PP02) via PR Reference.

Thanks With Regards,

Dinesh Kumar V.