Hello Teresa, manning
You have never been able to change the tax code in v19 or earlier or v2013 on a Spend Money transaction when it has been used in an Electronic Payments group. you can make a change however to a Bill payment.
If you need to change the taxcode on a Electronic Spend money then you must delete the electronic payment, change the taxcode and then reprocess the preparation of the Bank File. You do not of course resubmit the Bank File to the Bank.
Alternatively you can reverse the Spend Money and then reenter it with the same dates and details but with the correct tax code. you will then need to go into the Prepare Elec payments and select the 2 transactions that will zero out and again prepare the Bank file. You will then have corrected the tax.
Cheers
David