As per standard solution, a customer letter of credit must be entered in the sales order and retrieved in the field Shipment number while posting the packing slip. The field Shipment number in the packing slip registration form is greyed out when using the advanced warehouse management which means that customer letters of credit must be managed outside Dynamics despite there is a standard solution for the topic. It would be incredibly beneficial to unlock the field Shipment number also when using the advanced warehouse management, that would allow users to keep track of customer letters of credit and their status directly in the system.