Beginning July 1, 1993, in any case in which there has been a refund of tax payable under this Act attributable to a net loss carryback as provided for in Section 207, and that refund is subsequently determined to be an erroneous refund due to a reduction in the amount of the net loss which was originally carried back, a notice of deficiency for the erroneous refund amount may be issued at any time during the same time period in which a notice of deficiency can be issued on the loss year creating the carryback amount and subsequent erroneous refund. The amount of any proposed assessment set forth in the notice shall be limited to the amount of such erroneous refund.
35 ILCS 5/905