Automatic Journal Line: not create an JE for zero value?

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Maybe I am overthinking this........  Our WIP auto journal sometimes creates a zero value entry for variance not absorbed (line 30).  Not really an issue except this JE line is always missing dimensions required for our variance account.  Again - not a show stopper but it is annoying.    Is the best approach to create a filter for this line of the auto journal; [F:MWI]CSTELM(10)<>0 so it does not create an entry?  I'm not real sure I have the luxury of testing in pilot as I am not 100% sure what the scenario is that "creates"  these entries.  Only about 0.5% do.  Thanks.