Struggling to get the PartLookup form opening up with a customization…It’s a handheld form called from the Location button on the Container Receipt line. The only difference between other menu items I see. is the fact that the customization field has (Customization) in the customization field in menu maintenance vs one that works the customization id with a _Customization appended to it:
This one works

This one doesn’t and opens the standard form:

I had to use process calling maintenance and create a new menu to assign the customization to it.
I am very interested to know why there is a difference.
Any help appreciated.