Debit and credit notes.

we are uploading debit and credit

notes in Gstr1. but debit note taxable values and tax amount is added to credit note value instead of substracting debit note value. can please help us to resolve this issue.

example credit note tax of Rs.1000 and debit note tax of rs.100, net value should be shown of rs.900 but system showing Rs.1100.

regards
murali