incorrect Plan number

[HiVi]

A client of mine, we just recently discovered that we had been filing Schedule B for 10 years with an incorrect Plan Number, though EIN was correct. The client prepares their own Form 5500, and so it look like it is only the Schedule B plus PBGC Form 1/Schedule A that had been filed with the incorrect PN. Do we need to file amended Schedule B for 10 years? How about PBGC Form 1/Schedule A?

Hope somebody have had the same experience dealing with the issue.....

[WDIK]

Does the client have another active plan? If so, could there be confusion with the filings based on the respective plan numbers?

[HiVi]

They do have a 401k plan, but the plan sponsor only has one qualified db plan for which a Schedule B (and PBGC Form 1 and Schedule A) is required.

[WDIK]

Personally, I would correct it on a prospective basis...