Hi,

Thank for your advise, I finally managed to solve it, but
found it to be tedious like having a formula in the detail
to calculate the total, then had it share to display in the
header section.

Plus, when I had problem with any of the formula, my report
will be empty. Do you face the same problem since I want
my rpt to do all the calculation

>When is the formula calculating? Have you tried WhilePrintingRecords to force the calculation to happen later? Or do you need WhileReadingRecords? Try both and see what fits your needs.