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Error message in Crystal when trying to filter out certain people

Last Modified: 2015-03-03
Trying to get just patients who have not been seen in the last 180 days.
Grouped by location and then patient.

Tried putting this in my record select
Maximum ({@Clinical Date formatted}, {PERSON.SEARCHNAME}) > {@180daysago}
and got this error message:  This function cannot be used because it must be evaluated later.

This will work by putting it in the section expert for the group, but then it is just hiding those people, not eliminating them from the report.  

And if I do that, it causes another problem-- cannot get an accurate count of the people on the list, the count always includes the hidden ones!

Please help...
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