I figured this out.
For those that might be confused:
Use the FORMULA BUILDER in the create/edit rules interface to create a simple test that should produce a boolean output. e.g IsNull([something])=TRUE or Nz([something])=TRUE depending on datatype
Then if the bool is TRUE the action you identify in the action section will happen.
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joe vandervest
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Joe, I have a similar issue on the "new" forms that's frustrating the hell out of me. I have the exact formula you have listed above using IsNull: IsNull([Related Deployment])=TRUE
What I'm attempting to do is hide a section of the form if the related field is not set. This formula is still not yielding the result I want.
Screenshot of rule attached.
