Reg:Page numbers

Hi ,

     I am displaying page numbers on group header.

     For this i have written on formula field there i am incrementing based on group header and some some other column(if both values are same then i am incrementing page numbers)

     This is working for 2 pages but third page onwards page number is displaying (page 2) for all remaining pages.Will you please any suggestion.

Thanks,

Chakradhar.