This issue usually arises when a historic transaction, posted in a previous financial year, is reversed. If the reversed item is in a period not available to you (available periods are in Nominal Ledger - Transaction Periods), then the transaction should not be reversed. Instead, a negative posting should be posted to contra the original transaction.
Whenever possible it is encouraged that you should post a negative entry to contra the posting you wish to reverse. Reversing items in previous financial years not only runs the risk of this issue happening but also if values are changing, this will impact your Year End reporting figures.
If reversing an entry needs to be completed, and the item is in your last financial year, it is important to run a Retained Profit Rebuild, which can be done by following the steps below:
Click on Tools.
Click on Rebuild Nominal Balances.
Check the Rebuild Last Year Retained Profit.
Click Rebuild Balances.
If an item has been reversed, which was posted prior to your last financial year, then it's likely, after performing the retained profit rebuild, that you are still going to see a brought forward balance on the P&L Nominal. If this is the case, please raise a new case online and reference the title of this article.