Sum of variable

Question

I have a report data as following:
Invoice | Invoice Line | Supplier | Total Amt
Inv 1 0001 A 100
Inv 1 0002 B 100
Inv 2 0001 A 200
Inv 2 0002 B 200
I have done the report into grouping the data by suppress the Duplicate amount and become following
Invoice | Invoice Line | Supplier | Total Amt
Inv 1 0001 A 100
        0002 B
Inv 2 0001 A 200
        0002 B
I have use a variable to calculate how much of Supplier available by using count. In order to avoid duplicate Total Amt = 200, I create a variable C = sum(Total Amt) / count(Supplier). But one things is if I want to do the sum for Total Amt for the entire report. I am not able to use the Sum(Total Amt) in Report footer. And I am not able to do the Sum (Variable C). Any idea?

Answer 1

i gather you are grouping your report by customer then invoice number
use MANUAL running totals, the wizard may be the reason it is incorrect.
create 1 set of the 3 formulas listed below for customer and one set for invoice id.
RESET
The reset formula is placed in a group header report header to reset the summary to zero for each unique record it groups by.
whileprintingrecords;
Numbervar  X := 0;
CALCULATION
The calculation is placed adjacent to the field or formula that is being calculated.
(if there are duplicate values; create a group on the field that is being calculated on. If there are not duplicate records, the detail section is used.
whileprintingrecords;
Numbervar  X := x + ; ( or formula)
DISPLAY
The display is the sum of what is being calculated. This is placed in a group, page or report footer. (generally placed in the group footer of the group header where the reset is placed.)
whileprintingrecords;
Numbervar  X;