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Working Trial balance - If a journal has been prepared but not posted (with the intention of this being posted once the reviewer is satisfied with the accounts) in would be handy for the working trial balance account balance to appear here. So that the review can match the attached workpapers to this account and not have to work between two screens.

There are third-party tools - like RecHound - that can do what you are asking, but only for balance sheets.

Quick video here highlighting the features:
https://www.rechound.com/video-demo

If you like it, you can link it to your Xero and start a free non-obligation trial here:
https://app.rechound.com/starttrial

Yes, this is the way that reviewers would work through workpapers.

At least MYOB AE let you add a workpaper to a trial balance account. So much easier. They didnt get much else right but this was a big tick for MYOB AE

What a great suggestion! If the workpapers specify the Xero Client and period, they TB should be automatically loaded when the workpaper is initially created. After creation of the workpapers, only manual updates should be allowed.

Yes. This is how accountants do their paper workpapers. Supporting documents behind each ledger account.

This is really important and would save so much time from a review perspective, as well as improve the quality of the overall product.

Taking it one step further might be to have the workpapers automatically presented in the same order as the Notes to the accounts, with "Note totals" that can be expanded to see the detail $ balance of all accounts included in that note. ie if all Notes were "expanded", the workpaper home page would show the entire Trial Balance. Condensed, the Workpaper home page would reflect the $ per the Balance Sheet in Xero

This is critical