I just found tricky issue.
Imagine that you have template in the AF. Something like this:
And you want to create this PI Point from AF with custom UOM stored in the UOM_name attribute.
You probably would like to use similar string: Tag_name;UOM=%@UOM_name%
But this is not working, because UOM=xxx is overwrite by UOM configuration parameter after you create an element from this template.
So in the element the UOM=xxx is missing.
What to do?
Create ne UOM in the PSE with %@UOM_name% as name:
And now you can use this as UOM for your tag:
Simple and working solution.