1. Goto the hidden sheet called "SOData".
2. In Cell AP20, Type "24-DEC-14" without quotes
3. In Cell AP21, Paste the following formula without quotes "=GetExpiryDate(1,MONTH(AP20)+1,YEAR(AP20))"
4. In Cell Ap22, Paste the following formula without quotes "=GetExpiryDate(1,MONTH(AP21)+1,YEAR(AP21))"
5. In the "OAT" sheet choose "24-DEC-14" as the expiry date and do a "Refresh"