Asset Calender Issue in 11i

Hi,

We are trying to add more periods to an existing Asset calendar in 11i. We defined the Fiscal yaer as 01-OCT-2014 to  30-SEP-2015  as 2015. Periods per year =12

Period SEP-14-FY-14  is defined as   FROM Date  01-SEP-2014  TO Date  30-SEP-2014. 2014 Ends as of SEP2014 and  2015 starts.

Now when we keep cursor at TO date 30-SEP-2014   and hit enter to crate next period it  creates incorrectly  as  OCT-13-FY-15  -  from date 01-OCT-2014  To date 31-OCT-2014   The correct period  expected is  OCT-14-FY-15.

What is the basis on which system automatically creating the next  the period then we hit enter.  that may throw light on  why it is creating incorrectly or our configuration is incorrrect somewhere.