A012 - Maintain Referral Letter

Can we please get help on why this A012 - Maintain Referral Letter request ended in an error ?

Below are the details:

Hi,

I think this looks like a production issue? If so please could you use the national service desk so it can be logged and the right team checks it. The dev forum is only for non-production issues, or general questions - we would not want to risk exposing sensitive information.