"Date is not a valid date/time" Error

Step 1: Setup

1. Click BAS
   
2. Setup menu option
   
3. If Last BAS Return this year is showing as 'None', drop the list down and re-select 'None'
4. If PAYG W'Holding Paid To is showing as 'None', drop the list down and re-select 'None'
   
5. Close Cashbook
   

Step 2 : Control Panel

1. Open the Control panel on the computer and check the date format is regional settings. Make sure the date has slashes (/) not dashes (-) between the numbers of dates and the short-date format is 'dd/mm/yyyy'
2. Re-open Cashbook and repeat what was being done when the error occurred