Duplicated TAX in distribution lines

[amjibart]

Ive got invoices that have been paid for in Payables and cleared in cash management. How ever, there's a problem that TAX was being entered on 2 lines in distributions and as a result the amounts when reconciling wont match.e.g.
Line 1 Item and amount
Line 2 TAX
Line 3 TAX (this is where user made a mistake and that's why TAX is calculating twice)
are there ways that
i) i can reverse these transaction to be corrected
ii) can correct patch in the missing amount so that it balances when reconciling

Please help