Choosing Manufacture part item when creating purchase order via Requisition Line

Hello,

My Client need to be able to choose a manufacture part at the purchase order line

All PO's are created via purchase requisitions

In the purchase requisition I cannot find manufacture part filed and and on build phase at the PO I cannot update the Manufacture part filed (I can have more than one manufacture part per item)

I tried the feature "Search for Master Items Using Multiple Item Attributes When Creating Purchasing Documents" doesn't help due to using purchase requisition for PO creation

Pls help,

Oren Lupovich