We took over the administration of a 401(k) plan for PYE 12/31/2007 and I'm not sure how to prepare the Schedule SSA for 2007. We did not receive a copy of the 2002 or 2003 Form 5500 & Schedules from the client or former TPA, so I have no idea who they reported those years on the SSA and who they didn't - of if one was even done.

I guess my question is this: if I report someone with a code "A" that was already reported in 2002 or 2003, will that create a problem? What about removing someone (code "D") that was never reported in the first place?

I have absolutely no faith that the prior TPA prepared any of the Schedule SSA's correctly, if they even did them at all!

Any thoughts on this would be greatly appreciated!

Thanks.

I assume you are discussing a DB plan. But no matter.
If you have any doubt, just report all the VTs. Also, report any lump sum payments (using "D") even if you think they may have been reported before.