partner determination procedure attached to item category
I create and Partner Determination Procedure and i assigned to Item Category. I made partner function "account manager" partner function mandatory. When i create an order and enter the line items and save it asks for Partner function Account Manager missing.
If i create an order with more than one line items it only throws an error that partner function 'Account Manager" missing.
My question is why it is not throwing an error for other line items that manadatory partner function is missing.