What should the syntax be for a filter that is applied to a child cursor when the filter contains a reference to an object on the form?

I can get the filter to work by using , but I get an error when cancelling the form when the cusPushPopRecNo.Destroy method is run. The command in this method errors with "Object is not contained in a form.". I have tried using . The filter works, but I get a syntax error on the same line in the cusPushPopRecNo.destroy method.

It seems I need to somehow get the object reference of the form that I'm cancelling from in the filter command, but I can't seem to get the syntax right. Any ideas?

Tim