Use set analysis to exclude NULL results in a KPI measure

[Darren1]

I would like to use set analysis to exclude NULL results in a KPI measure. However when I use the scripts below it does not exclude the NULL results and displays the full "goal" total.  The "WIP.fips" is a string field. 

Sample script:

Sum({<[WIP.fips] = {'*'}>} [goal])

This is the full set analysis I am trying to create:

Sum({<[wip_bmp] = {'Cover Crop'}, [WIP.year] = {'2025'}, [type] = {'Agronomic'}, [WIP.county] = {'Allegany'}, [WIP.fips] = {'*'}>} [goal])

In my attached picture I would like to exclude the records with no value in the fips field (red mark). 

Thanks! 

[brunobertels]

hi may be one of this 

Sum({<[WIP.fips] = {'*'}-{''}>} [goal])

Sum({<[WIP.fips] = {"=not isnull([WIP.fips] )"}>} [goal])