How to reproduce:

1. Create a Sales Order with drop shipment marked.
2 Run "Generate PO from Sales Order"

• Select the order in step 1.

• Select Drop Shipment = Yes
  3. Lookup the newly created Purchase Order.
  4. Add a freight line/rounding (as a charge) on the purchase order
  5. Complete the Purchase Order.
  6. Do a material receipt on the purchase order and select all lines.
  7. Try to complete the material receipt. This won't work because the charge is not connected to the sales order and iDempiere wants that connection when creating the automatic shipment.

Some questions arises:

• Should a charge/product without a connection to the sales order be allowed on a drop shipment purchase order?

• One solution is to not include the non-sales order item in the automatically created shipment (my preferred solution)

• In my specific case it was a rounding charge. It could be placed on the invoice later.

Suggested solution in development (minor code adjustments needed)