Load-bearing level
When loading requirements involve heavy-light pairing, "heavy not on light", or "large not on small", you can set the load-bearing level based on the gross weight per box, density or size of the cargo.
The load-bearing level represents the cargo's bearing capability; cargo with a higher level is placed below cargo with a lower level.
Load-bearing level is a relative value: the larger the value, the stronger the bearing capability, and the more the item goes on the bottom. The software default is 10 for all cargo.
For example: cargo B cannot be pressed and must be on top; cargo A must be at the bottom. The load-bearing levels of A, B and C can be 13, 8 and 9 respectively. The system default is 10.

Resulting plan:
