I have a simple lookup field in a form. The field name is Entity_ID and the main form it references is called Entity. I need to filter this view by Entity but seem unable to do so. Previous suggestions include something like

#View:test_view?Entity.Entity_ID=8888888888888

This has no effect and does not filter the view. 

I have also tried 

#View:test_view?Entity=8888888888888

This yields a blank view. 

Any ideas as to what I am doing wrong? Previous post would seem to indicate this is the way to do it. Curiously, the same method works for any non-lookup fields. 

Thanks,

John