You have the possibility to maintain a resource’s tare weight on the physical properties tab of the TM Resource Master.
This tare weight has an influence on the gross weight stored in the TOR->Root and is the reason why gross and net weight can differ.
While net_wei_val is the sum of the accumulated cargo gross weights, the gro_wei_val also adds the tare weight of our resource. So the Cargo weight on our general data tab always shows the net weight and not the gross weight.