Print proforma packing slip from shipment or load

By design the packing slip posting is done at the end of the logistical process when the last container for a shipment is closed (1 shipment per load), or after the outbound load is confirmed. The existing Packing LIST document is not very useful without heavy report customization. Physical process: Often a physical packing slip is needed earlier in the process: e.g. in case of multiple shipments per load, or when packed container picking is worked after the packing station. Proposed solution: From the outbound shipment (resp. load), a new button Print proforma packing slip. This should in the background fill the packing slip posting screen (SalesParmTable and SalesParmLine) based on the shipment lines (resp. load lines) (WHSLoadLine). Print the document according to the settings of the packing slip. The ID on the proforma packing slip should be the shipment ID.