Phantom Parts

Does a phantom have to be a phantom in both plants?

I was thinking if set Phantom on Part Detail it has to be set on the plant level. If I have 2 plants does it need to be set at both plants.

I have 3 Plants and 1 is not currently using the Phantoms. As long as the other Plants use the Alt Method you should be ok. Phantoms are checked off at the Plant level,