Column in SELECT list not valid

Hello.
I need your help finding a better solution to my select statement. In the Month1 expression, I reference DueDate to place sum of units in Month1 bracket. My query requires the DueDate to be part of the group which is not the desired result.  

Results show groups of the sum units for each DueDate.
Stlye,Color,Month1
1111,BLK,10
1111,BLK,20
1111,BLK,30

Goal: 1111,BLK,60
SELECT
Style,
Color,
(CASE WHEN (SUBSTRING((DueDate),5,2)<=MONTH(CURRENT_DATE) and (LEFT((DueDate),4))<=YEAR(CURRENT_DATE)) THEN SUM(UNITS) ELSE 0 END) as Month1

FROM ORDERS
GROUP BY Style, Color, DueDate

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FrankJGarciaAsked:
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ShivCommented:
what's your backened database? Oracle??
0
Guy Hengel [angelIII / a3]Billing EngineerCommented:
SELECT
Style,
Color,
SUM (CASE WHEN (SUBSTRING((DueDate),5,2)<=MONTH(CURRENT_DATE) and (LEFT((DueDate),4))<=YEAR(CURRENT_DATE)) THEN UNITS ELSE 0 END) as Month1

FROM ORDERS
GROUP BY Style, Color
0

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FrankJGarciaAuthor Commented:
IBM iSeries; ODBC connector using Client Access driver.

Angellll: Simplistic and useful. I thought I took that route but I received an error. I tested it again and it gave me an error. I then notice I was SUMming on top of another SUM. Your solution worked. Thank you very much.
0
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