Added new setup to fill "Your Reference" for combined shipment to enable sending these as e-documents

The field "Your Reference" is mandatory when exporting invoices as e-documents. This can cause additional, manual data entry when the combine shipment module is used. To make the process easier, it is now possible that the field "Your Reference" is filled automatically. This will not affect invoices that are created with the combine shipment wrap "Singe Invoice".

To use this, please enable the new setup "Set Your Reference for Combined Shipment" in Wood Setup: 

The field "Your Reference" of the resulting Sales Invoice will be automatically filled with the value "Combine Shipment":