If an exemption is approved by the Department or by a final court decision in proceedings to review an exemption decision of the Department under the Administrative Review Law then a certificate of error shall be issued under Section 14-15 or 14-20 if one of the following is met:
     (a) If the property became eligible for the exemption at an earlier time, a certificate of error shall be issued for the period of eligibility, but in no event, except as otherwise provided in this subsection (a), for more than the 3 assessment years immediately preceding the assessment year for which the exemption was approved. A certificate of error shall be issued for the period of eligibility, but in no event for more than the 5 assessment years immediately preceding the assessment year for which the exemption was approved, if the municipality requests the certificate of error before January 1, 1995.

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     (b) If the property is subsequently erroneously assessed as non-exempt, that error shall be remedied by the issuance of a certificate of error.
     (c) If the owner failed to file an application for exemption, or a certificate of status under Section 15-10, for an assessment year following the assessment year for which the exemption was approved and the property remains eligible for exemption for the following year.