Error in 2008 return-how to appeal Revenue Assesment

Looking for advice on how to write a letter of appeal to Revenue...Due to mislaid P60 the wrong figure was entered for Schedule E which resulted in Revenue issuing a notice of assessment showing additional tax due - have since got correct P60 details from employer which prove that the incorrect amount was entered on 2008 tax return....
Is it necessary to complete a new tax return? (Form 11/12) or can a spreadsheet showing the breakdown of Schedule E income be submitted with a letter explaining the mistake that was made on the original tax return?

The amount of additional tax as per the Revenue assessment has been paid to Revenue in the meantime, pending the outcome of the appeal, although it should be a straightforward case, where a genuine error was made...

Any advice appreciated
Thanks in advance

A letter with copy of the correct P60 to the district which issued the assessment should suffice. It would not be necessary to file return again.

Thanks for the advice

I've been having a similiar problem recently. I made a mistake in my filing and got a large demand. I rang my local tax office to recify this and they were very helpful.. except in the correction they made an error which resulting in me getting another demand. I rang again and it was sorted. I think getting a person and routing all correspondance through them is best. Good luck