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I have a file consisting of the following fields:
Invoice
Type
Item
Quantity

When the type is 'O', the quantity should be treated as a positive number, otherwise as a negative.
I would like to be able to select the total quantity for a specific invoice and item using SQL.
When I tried to do this using CASE for the Type field, I get an error that the field is not valid since it is not in my group by.

The SQL that I get an error on is:
SELECT Case SbTypE WHen 'O' Then SUM(SBQSHP) Else SUM(SBQSHP *   
-1) End FROM VSADETL WHERE SBCmp = 1 and SbInv = 328258 and SbCSIT 
= 'PR  PR026'                                     

                 
Is there a way to do this in one statement?

Thanks,
 
Jeff Young
Sr. Programmer Analyst
IBM -e(logo) server Certified Systems Exper - iSeries Technical Solutions V5R2 
IBM  Certified Specialist- e(logo) server i5Series Technical Solutions Designer V5R3
IBM  Certified Specialist- e(logo)server i5Series Technical Solutions Implementer V5R3

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