Changed the combine shipment method code is now taken from the sales header instead of the customer

The combine shipment condition can be set on the customer card. That combine shipment condition is then always used to create invoices and credit memo's. there are situations that the customer doesn't want to have a specific order/return order combined with other orders. Therefore the change is implemented that the combine shipment condition is taken over to the sales documents. 

It can be changed and that combine shipment condition is used when calculating the combine shipment journal.

The combine shipment condition on the customer card is now transferred to the sales documents: