Need to adjust Tax in Receivables

Hello Team,

There is an Existing Invoice where Tax has been calculated which shouldn’t be but it did due to wrong Tax calculation from third party Tax system

Now the Invoice is already accounted and GL posting is done.

So do we need to adjust the Tax ?If so please can anyone guide how to square off the tax Amount?

If the invoice is not paid/amount received, how to to create a adjustment for tax amount and reduce the same.?