In NX, I can replace a family member in an assembly via the part family menu. In my case I have an string expression in my assembly file, that I wish to use. I select the family attribute in question, then in the critreria search field it type =Expression_name. An information screen appears and reads " =Expression_name is not a valid value for Expression_name". For numerical values there are no issues. My expression_name value is "SHORT". I can only assume NX is stripping the quotation marks to SHORT, and as the available valid values are "SHORT" and "LONG" there is no match. What is the solution (is it in changing the expression value, or criteria search field syntax)?
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