You might see if the logic in the following thread seems to apply to your question:
http://benefitslink.com/boards/index.php/topic/44985-impermissible-distribution/
From EPCRS:
(4) Overpayment. The term “Overpayment” means a 403(b) Failure due to a payment being made to a participant or beneficiary that exceeds the amount payable to the participant or beneficiary under the terms of the plan or that exceeds a limitation provided in the Code or regulations. Overpayments include both payments either made from the participant’s or beneficiary’s 403(b) custodial account or annuity contract under the plan or not permitted to be paid under the Code, the regulations, or the terms of the plan. However, an Overpayment does not include a payment that is made pursuant to a correction method provided under this revenue procedure for a different 403(b) Failure. Overpayments must be corrected in accordance with section 6.06(4).
And:
(e) Notification of employee. Except as provided in section 6.02(5)© with respect to the recovery of small overpayments, the employer must notify the employee that the Overpayment was not eligible for favorable tax treatment accorded to distributions from an eligible retirement plan under § 402©(8)(B) (and, specifically, was not eligible for tax-free rollover).