i have been going through this with our SIMS LA support guys, they have said i should look through the Capita knowledgebase (which i couldnt find!)to try and find a fix as they were unsure, i would assume it will take quite some time for them to sift through all our data trying to find duplicate entries etc.
Your very welcome,
I believe that its possible for capita to run a script on the data set which identifies the cause of the problem and where in the database the entry is located. This is usually how the problem is resolved.