What is the best way if AP transactions is incorrect

Hi everyone,

I have a problem in AP. This is the scenario.

Users created an Invoice, the amount should be in USD but they encode it in PHP. They run the Create Accounting and posted to GL also.
     Example:
            Invoice No.         Amount in PHP          Amount in USD  
                123456                4,300                        100             ----> instead of USD 100  they encode it USD 4,300 
This is obviously user error, but how can we fix it since wrong data is already in the system.

thanks,

Leony