I am trying to write a saved search formula that runs on a parent record and will check a set of child records and see if one exists with a certain field value.  If one does, I want to filter out the parent record from my results.  I have tried CASE WHEN and DECODE with no luck.  The parent record that I am trying to filter out is still in the results. In this particular case, there were 5 child records, one matched my criteria and the parent record was repeated in the results 4 times. 
Any help would be appreciated.
Marcus
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