Adjusting the amount for a Paid Invoice

Hi All,

We have encountered a situation where we had an invoice with amount as 211.83.

It has one item line with amount 187.46 and one tax line of amount 24.37.

The tax line was discarded and the invoice was paid only for the item and another invoice with amount 24.37 for tax was created manually.

Now they want to change the amount of the main invoice to 187.46 from 211.83.

But they are unable to change it. Can you please advise.

Thanks,

Akshaya