Almost there...
In the database I've created, when opening the referral form, then adding a new 'Offender', then trying to add a new 'Referrer' - a message comes up saying that it can't find the Key ID of the 'Referrer' in the Referrer Table.
The strange thing is that this message only comes up when I add a new 'Offender'. If I select an 'Offender' who already exists, then I can add a new 'Referrer' without any problems.
What am I doing wrong? I'm sure this was working earlier on in the development, but I don't know what it is I've done to make it come up with this error. I've attached another copy.