RE: Error Handling in Back to back order
Good Day and Happy New Year,
When an issue like this arises for me I teach customers to reverse the links on the PO. On the PO, I would delete the lines, then update the correct Vendor. On the Shipping Fast Tab, for the PO, update the Customer Address that the Purchase Order links too. Then add the Purchase Line, on the main Action Bar, click Actions/Functions/Drop Shipment/Get Sales Orders. This will bring in the Sales Order lines to the PO and link them.
If the SO has the incorrect customer, you almost have to follow the same steps to de-link the PO, then correct the SO Customer. Then make sure on the Sales Lines you designated the Purchasing Code for DROP SHIP. After the update go back to the PO and update the PO with Drop Ship SO information (noted above). This issue is like starting over.
Hope this helps and gives you some insight.
Steve