HI Johan,
See my reply to your previous post on partial Save. I would guess that the Form template is doing an Insert when "Partial Save" is requested. At that point, the Server Values are written to the record and a GUID for this new record is generated. The Server would then "read the record that was just Inserted" and put the fields into Server Values. There, you should find the GUID of the inserted Record and you could manually test it. I don't know about the actual code but it might return a message that the INSERT failed?
I would look at the code and see what Bruce is doing at the time of INSERT and how it handles any errors.
Ron