Select Grid - XPath not working?

It looks like the XPath is not used in filtering the records in a Select form. Could that be true? If so, why is this property there? I worked around it by defaulting a search field with the value a needed. In my case that worked good enough, that will not always be the case.
1 answers

I tested it in

In such cases, I get a warning like this

property xpath constraint on the grid of the pop-up form has no 
effect when the form is used for selecting. Instead, the selection 
constraints properties of the reference set selector can be used to
 constrain the selectable objects
(by the way: was there a way to copy/paste the text of this warning? I typed it...)

I think this is acceptable...?