Hi Expert,
I create a sales order with two items, one is normal item, one is charge item. Mark Normal item to drop ship, and assign this charge item

Then, I just create a purchase order and linked above sales order

Post this drop ship PO to receipt, then sales order will create shipment automatically. then go to sales order and post sales invoice, it error out: You cannot assign more than 0 units in Document Type = Order, Document No. = S-ORD101010,Line No. = 20000.
It seems like when I just create shipment through drop ship PO is different with create shipment through sales order for charge item. could anyone shed me some lights on how to use drop ship Po to post charge item when shipment is created?
Thanks,
Ming