This would apply to every item applied bought from the item depot. It would be the following 2 UVs:
Heat Bonus: +25%
Forge Cost: -10%
Punch would refuse to lock any UVs when the item his either of these UVs, meaning that you cannot combine these UVs with others. Because they are UVs, when you craft an item up, it would (at the player's choice) retain the UVs. This would be intended to aid players who buy from the depot.
If this makes crafting not so necessary, then I suggest that the UV chance on crafting to be increased. (Optimally, you should have 100% chance when upgrading a 4* item to a 5* item.)
As someone with a large number of 5* items lacking heat, this sounds like OOO slapping me aside for new players again.