Subcontract: Material Transfer with Multiple PO Item

Hi, we have few raw materials like (nuts) that we send out for treatment, so I flow the process of created BOM of each material and PO for same.
Let say:

  1. I have a PO with 5 items.
  2. Each item has its BOM,
  3. When I click transfer, it let me select only one BOM at a time.

so I am looking for solution where I can Transfer material for all PO items in single stock entry, so I can have single Outward material document for a supplier.

Since it a link field on the main form, you can create one my transfer entry for a PO at a time.