As stated, these (DR) are built-in and are not needed to be entered anywhere in the phone. I just tested using a GXV where the inbound route for a DID is told to use the DR and routed to a Q and they work fine when reaching the GXV. Eliminate the text from what you have entered in the phone and leave blank. Test using DR2 and DR3 and see if you hear a difference.
I suppose it possible that GS may have removed from the GXP built-in, but I do not think so as I have been using for years.