This problem occurs mainly in case final customer organizes shipment and send a truck with insufficient space, so that some pallets must be left behind for next load.
A packed container can now be moved beetween shipments/loads only if you reduce the picked quantity from load to a deteminated location without licence plate.
This procedure has some defects:
-it is time consuming with multiple lines
-you loose container information, even licence plate
-items become free and usable for everybody and that is not correct

My suggestion is to let the container be moved in a new load or in an existing one not shipped yet.
With this step, shipment should be created accordingly.

Thank you in advance for your attention and feedback