If after the Statement Run, the warning is not removed:

1. Click on the Warning

2. The problem will be that the 'Last Performed Date' was not re-set correctly. Click on 'Process Debtors' 

3. Select the 'Statement' tab

4. Perform the Statement Run again and set the dates as per the last statement run

Do not re-print the statements but DO process the Statement Run

5. At the last screen select the 'Close the Statement Run' button

6. The Warning button should now be gone.