Export invoice wrong entry in 3B to be rectified

This query is : Resolved

Gopalakrishnan. S (Querist)
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20 November 2021 Sir,

One of my friend has made an export shippment in FY 2019. While entering the sales in 3B return, instead of Table 3.1 (b), they have entered in Table 3.1 (a). On getting reminder from GST, stating that the said invoice has not been sent to ICEGATE for the error and asking to rectify it, they have now entered the sales in the correct column and have submitted the 3B return and now, the said invoice has been forwarded to ICEGATE ( as per tracking system available in GST portal).
But the issue is, how to get back the TAX credit for the GST amount wrongly entered in Table 3.1 (a) earlier, since the amount has been deducted in the credit ledger at that time, i.e the same GST amount has been deducted twice from the available ITC in the credit ledger in the above 2 occassions.

Pls. advice.