a simple question on page number in sapscript

hi all,

i'm using the following syntax to print page number at header level, however it alwasy comes as PAGE 1 OF total-page. That means if i have total 5 pages,

it will print PAGE 1 OF 5 for all the pages.

please advise where is the problem. thanks.

<s>Page &PAGE& OF &SAPSCRIPT-FORMPAGES&</>