Crystal Report issue.

I want to get summation of Liters .
I wrote equation of like this.
Sum ({@VOLiter},({product_mast.pd_product_group_code}) ).

But error coming The summery/Total field could not be created.

So after I make group also for  {product_mast.pd_product_group_code}) filed.but still it's coming same error.

(My{@VOLiter} field including this  summation
 tonumber ({@DecDisBox1}) * tonumber({@LITERS} ) sumation)

Kindly assist me for this issue.
Neranjan PremAsked:
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Ido MilletProfessor of MIS at Penn State Erie and Owner, Millet SoftwareCommented:
Crystal can't sum another sum (and can't sum print-time formulas, such as those that depend on shared variables) .
Instead, sum the desired detail-level data directly to the desired aggregation level or use formula logic to accumulate values into a variable.
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mlmccCommented:
What are the other formulas?
DecDisBox1 and LITERS

mlmcc
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Ido MilletProfessor of MIS at Penn State Erie and Owner, Millet SoftwareCommented:
you asked me to
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