I can try it later with QDSCV but similar problem is with RDDS so I can test it immediately.
See URL described in other topic:
I added in RGV fiter to "Subject Starting with Q".
No data selected, no data displayed.
I clicked Add in RDF.
See that no 0 (zero) is filled/displayed in ID (integer field) after adding.
But OK, we will continue.
Some date, into Subject and Test I added "Question?"
I clicked OK (in event must be fired SubmitChanges()).
My record goes empty (??) and no record added to grid.
I restarted application - no "Question?" is present.
Sources are described in PDF but what is important:
one RDDS and both RGV and RDF ItemSources are bind to DataView of RDDS.