Adjustment of itc after opting for composition levy.

I wrongly claimed ITC in the CGST/SGST column instead of IGST column in the GSTR3B of Aug, 18 and thereafter utilized the ITC. I opted for Composition levy w.e.f 1^St October, 2018. The mistake was caught in the Month of April, 19. Is there any way to reverse the wrong ITC of CGST/SGST and claim ITC of IGST of the same amount to nullify my mistake?