Andrew:
I think Steve's suggestion makes sense. There are other situations where a $0.00 transaction comes from AP to the GL. For instance, if a detail line is being added to an AP invoice and a tax amount is calculated (using a Distribution Code) but then zeroed out manually, the $0.00 tax entry flows to the GL (issue sent recently to Support).

In this case I don't think the transaction should even be created at all in AP.