@Jmcvittie
ADDENDUM
TIP: If you haven't already started the 2023 amending process, I would first make a backup copy of the *.tax2023 data file as originally filed, as well as a PDF of the 2023 return as originally filed and store those somewhere safe and secure. Then if anything goes wrong during the amending process, you will still have the original data as filed, and with which you can start the amending process again if necessary.
Remember all PDF tax documents and tax data files are very sensitive files, since they contain your personal ID info, financial data, and possibly bank account numbers, etc. Be sure to store them safely and securely to guard against computer theft, hacking, etc.
