I provided an B2B invoice with CGST & SGST to my customer (GSTIN of another State) by mistake. I thought it would be same State as I am supplying goods within my State though GSTIN of my customer is another State. I see this mistake when I try to file GSTR1 of the invoice while choosing POS(place of supply).
So my question is:
Is it okay to file the GSTR1 of the invoice as IGST (correct one) though the invoice is incorrect ?
OR, Should I file it as incorrectly and amend in next month? (I am not sure if this is possible).