GI to Sub - Contracting PO for MTO

Dear Sir :

I want to Sub - Contracting a Sub-assy process to a vendor.

Strategy used is 20 (MTO).

BOM Components of Sub-assy is in Sales Order Stock.

While GI to PO, Deflict Stock Error is seen.

Pls find the attachment for PR Screen.

Procurement Type of Header Material is X and,

In Routing Contains 1 operation of Control Key "PP01".

Thanks in Advance,

Dinesh Kumar V.