Issue: Users may encounter the following error when starting a new blank Excel sheet within a binder and attempting to add a reconciliation field in this new sheet:
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​error: A worksheet must have an ID to create a key value.
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​Cause: The new sheet is not properly recognized by Active.
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​Workaround/Resolution: Right-click within the side pane and select 'Refresh' or 'Reload'.
Alternatively, close and reopen the binder, then try adding the reconciliation field again.

This will ensure that the added sheet is assigned a workpaper ID.
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If the issue persists, follow the steps outlined in the article Active WP - Error: 'The supplied file does not contain a workpaper id.