It is not possible to re-run your Year End (YE) once it has been processed. However, it is possible to back post into your previous years' transaction periods, and then perform a rebuild of your matter/nominal ledgers.
To action this please follow the steps below:
From the DPS Home Screen, select Nominal Ledger.
Select Transaction Periods.
Under the Closed column, Untick the period you which to post in.
Click Update Periods.
Select the chosen period from the New Posting Period drop-down box, then click Set New Posting Period.
Post the relevant journals/transaction postings.
Close the period by following steps 2-4 above, ticking the period as closed.
Go to Tools, select Rebuild Nominal Balances, click Rebuild Last Year Retained Profit, then click Rebuild Balances.
Optional dependant on the back postings that have been made. Under Tools, select Rebuild Matter Balances/Rebuild Supplier Balances, and click Rebuild Balances.
Re-run the relevant reports which will have changes for your YE.