refund of SEZ supply with IGST payment

Info Tax (20 Points)

11 March 2018  
At the time of filing gstr3b dealer forgot to mention zero rated sale (supply to SEZ Maharashtra)with payment of IGST but show as normal outward supply with IGST; but in GSTR 1 properly mention SEZ sale with IGST payment , system not allowed to file refund application. Any solution?