The initial assessment was made in 2001 so I fall under the 1993 scheme.
Just a little additional information. I have had no contact with my ex wife or my daughter for many years. My daughter was 19 on the 16 Feb 2013, so I asked the CSA why I was still being charged in March 2013 as I had expected this to stop on her 19th birthday. The reply I got took two weeks to receive and I was told that the case was being closed effective from August 2012. it seems that Melissa finished further education and stopped receiving child benefit last year but somehow I was not informed and my payment were not stopped. I am currently waiting to find out when I will receive the excess payments credited back to my account. This is when I decided to find out if there had been any other administration errors. I have No arrears and have paid all that has been asked of me by direct debit.
Thanks for the information you have confirmed just about what I understood from reading the 1993 rules for calculating the maintenance requirements for my daughter. The CSA systems should have reduced the care allowance that was collected from me and reassessed both my income and changed circumstances (Protected income) as well as the changed circumstances of my ex wife. Obviously this was not done. Under the rules of the CSA retrospective claims are not allowed. I will write to the CSA again asking why there procedures were not adhered to depending on there response I will decide whether or not to try and claim the money back as they have clearly not followed their own procedures (Maladministration as it is defined in the publications)
Thanks for your help