This is a typical cement industry scenario.The client is receiving RM say 100 tonnes from a vendor.
while receiving it he receives say 90 tonnes. In std SAP liablility will be created based on the GR qty received for both vendor & transporter. In our case the client wants to create liability for the freight at actual weight i.e 90 & for the rm vendor for 100 tonnes. This dual liability has to take place at the time of GR itself. The client doesn't want to do subsequent adjustments.Most of the cement industries are working like this only.