I would start with Data Verification because that's the easiest option. If that doesn't fix it, try restoring the pre-upgrade backup to a new company and let it redo the conversion; make sure you do this at the server if you're on a network. If you still have a problem, a good next step would be to run data verification in the old version and then the convert again.

Since you probably replaced the old version with 2021 when you upgraded that means either installing the old version again or sending your data to someone else for the verification. If you want to do it yourself, the best thing would be to find a PC that doesn't currently have Sage 50 installed on and load the old version as a stand-alone installation. That way you won't interfere with your 2021 installation. If you don't want to go to the trouble of doing that you can contact me at [email protected] or 918-851-9713 and I can quote you a price for doing the verification for you.

could I restore an archive company that has been converted to 2021?

If I restore a pre-upgrade backup to a new company and everything is good, can I then backup and restore that company into my original company?

Thank you.

Yes. Keep in mind that if you have done any work in the original company since the conversion it will be lost when you restore over it. That work would need to be redone anyway, you just need to make sure you know what needs to be re-entered.

Once you've done that it would be a good idea to delete the duplicate company so nobody opens it by mistake. Just delete the folder that the new company is stored in.

Got it!  We had printed an audit trail of entries done.  

Thanks for your assistance