A workaround to this is to hit tag for search and it should still highlight the resource that you don't have enough of even though it says you have enough. In some cases, the game says you have more of a resource than you actually have available. Can also happen when trying to build an automatron, structures in a settlement, or modifying armor.When trying to craft a weapon mod, the game will display the notification telling you that you lack the necessary items, even though it shows you have the right perks and a sufficient amount of crafting materials.This can potentially break the game because this allows you to put a MIRV launcher on a minigun. There is a glitch where if you time it correctly, you can put mods from other weapons on to another weapon.Now you pass the condition check, just build it. If success, the confirm will pop, the selection hovered on a different item. You can select an available mod/item, then press 'E' and quickly move the mouse to select another mod at the same time. When you want to modify/make a weapon/armor/item but you don't have the perk.