This can be done via either the LAD or FED Desktops, through the Todays Time icon:
In LAD select Enquiries tab and Time.
In FED select Home tab and Time Recording dropdown select Today's Time.
When in Today's Time check you don't have Show Posted highlighted.
Fill in the date range From a date earlier than the period you are trying to close down.
Get rid of Posted by and make it blank.
Select Refresh to find all the entries.
These will either need to be posted or reversed.
To do this highlight the line and then either select Reverse or Update dependent on which option you need to do.