Special procurement key 40

I have added following selections in special procurement key 40

Checked box - Withdrawal from an alternative plant In section AS BOM COMPONENT

Also added ISSUING PLANT

IN BOM OF FINISHED PRODUCT, THIS KEY IS ASSIGNED TO SUBASSEMBLY.

WHEN SALES ORDER FOR FINISHED PRODUCT IS CREATED THEN AFTER MRP SYSTEM DOES NOT CREATE STOCK TRANSPORT REQUISITION IN PLANNING PLANT FOR SUBASSEMBLY. PLANNED ORDER IS CREATED IN PRODUCTION PLANT.

HOW TO HAVE STOCK TRANSPORT REQUISITION IN PLANNING PLANT ??