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I've checked my entries and confirmed that Part I and Part III will not accept values less than 0.  So truly the "modulus" of the value is wanted.  

Line 3a has $0.  Line 36 has $3567.  

What does the message mean?  "Form 7203: Line 3a cannot have a gain in Part I and a loss in Part III."  

I do not have a gain in Line 3a.  Furthermore Line 3a doesn't actually exist in Part III so is this message trying to tell me it doesn't like my value in Line 36?