Error in filing GSTR 3B

Vipin Kumar (127 Points)

16 September 2017  
we have taken advance from inter state unregd customer in july and paid IGST on it in the return GSTR 3B of july

consumer took the goods in august and we have adjusted the paid IGST in the invoice and our IGST liability is nil for the month of August

now when we are filing GSTR 3b Of aug we are not entering any IGST in table 3.1 But we are declaring it in table 3.2 details of inter state supplies made to unregistered person

but the Portal is not accepting the transaction and throwing an error "Total Amount of Integrated Tax in Section 3.2 Should be less than or equal to section 3.1(a)"

please guide us what to do