Mike T

Client self-prepared last year's return and omitted a W-2. IRS sent him a transcript showing the unreported W-2, but only summarized the employer's name and address with four characters. He has no recollection of that who that employer was (one of six for the year). I input the W-2 with "unknown address" but it fails the check for invalid zip code. How can I work around this and be able to e-file the Amended return?