When you create a Fund record this should be within the Capital & Reserves area on the Balance Sheet.
However, it's possible to create a Fund record using a Profit & Loss nominal code without any warning being given. For example, 4010.
This means when the year end is ran, any balance on the Fund record clears down to the retained P&L code on the Balance Sheet, rather than the balance on the Fund record being carried forward into the new financial year. This can also show on a Brought forward Trial Balance report.
This can occur in v27 and above.
NOTE: This issue is resolved in v32.1 and above of Sage 50 Accounts. If you aren't using the latest version upgrade now.As a workaround you can: