Circular reference at check in to the Vault

SW2007 sp4.0

I have a user that is getting error 702, which I did look at in theknowledge base and found no real help on solving this, whenchecking an assembly into the datavault. The error is referencing acircular reference, I haven't been using SW for too long so I havenever ran across this error, so, how do I trouble shoot thisassembly to find the issue?

SolidworksWorkgroup Pdm