i have defined macro like services($searchterm$,$mng$,$fng$)
how can we write validation expression? if we don't mention $searchterm$ while searching, it displays with validation message.
Validation expression: isnotnull($searchterm$)
Validation error message: The search term value that you have provided is not valid. Enter a valid search term.
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It's not working for me. Maybe something changed since 2016?