Calculating total discount at the row level

Question

Hi,
I want to determine the total discount amount for all of the invoice row levels by summing the row totals that have the same discount % and then multiplying that total by the row discount percent.
Example:
Lets say there is an invoice with 3 line items
Qty     ItemCode     Price    Discount%
2         A                $30            10
2         B                $20            10
2         C                $15             5
I want to figure the total for the first 2 lines (because they have the same discount amount) by multiplying the quantity (230)+(220)=100 and then calculating the discount from this total. (100) * (.10) = $10 and then calculating the discount for the third line item ((215).05)=1.5. This brings the total discount amount to $11.50.
Below is what I have drafted for a query so far.
Select
//For each grouping of items with the same discount %
(SUM ((T0.Quantity * T0.PriceBefDi)) * DiscPrcnt)
FROM INV1 T0 WHERE T0.DocEntry=$[OINV.DocEntry]
Any ideas?
Thanks,
Luke

Answer 1

Gordon,
I was thinking that I would have to use a group by (grouping on the discount %) statement or possible a sub-query to accomplish this. The group by statement would replace the commented section. "//For each grouping of items with the same discount %"
I will work on this query some more and post my results if I figure out a way to accomplish this.
Thanks,
Luke