Clearing through F.13 in special posting period 13

Hi Gurus,

I wanted to clear the transactions through F.13 with special posting period 13. The message shows F502 : "Posting period 012 2008 is not open".

Our Financial year is : 2008 ( April 2008 to March 2009)

In OB52 We have closed the posting period for 2008 and open special posting period in the following manner

0001 + 0000 zzzz 02 2009 02 2009 13 2008 16 2008.

Still why the system is not accepting the special posting period 13 for the posting date 31.03.2009 (2008 fiscal year) in transaction code F.13

Regards,

Babjee