Checkpoint building help

[zaqer50]

I was wondering how I could make a way so when a unit drops a certain into the inventory slot of a certain building it would open a gate. Ive been messing around and I can't seem to make it work

If this is unclear tell me and i'll rephrase it.

Thanks in advance

 

[Korolen]

Well, if you want it so that you can only pass if you have the key, then I wouldn't suggest putting the item into a inventory slot, but just making it so if you walk up to the gate, and you have the item, then it opens.