calculated value in ?headers of hiCreateReportField

Hi,

i creat a form with an report field. The value in the header should not a fixed value in the code, it should be a varialbe.

but i get an error, fixnum req.

here is the code

------------------------------------------------

width = 30x ( some digit)

reportField = hiCreateReportField(
        ?name       'reportField
        ?title      "Report"
        ?selectMode 'multiple
        ?headers    '(
                       ("obj-type"     75   'left)
                      ("l"            75   'left)
                      ("pp"           75   'left)
                      ("description"  width   'left)
                      )
        ?choices     ch
)

-----------------------------------------

 if i change with to e.g. 100 , everything is fine.