SQL "GROUP BY" Warning

I've been working on a report program using Embedded SQL.  It uses a cursor to 
select data from multiple files and does a GROUP BY
option on the SELECT.  This worked as expected when I ran the SELECT statement 
using Interactive SQL; however, it did not work as
expected when embedded in the program.  It did not give an error.  It gave me 
data, but did not group the data as expected.  I
finally lucked out and found a parameter in the compile options ALWCPYDTA 
(Allow Copy Data).  It has three options *OPTIMIZE, *YES,
*NO.  *OPTIMIZE is the default.  I tried recompiling my program using 
ALWCPYDTA(*YES) and found that this solved my problem.

Has anyone had experience with this?  Is this a bug in the SQL pre-compilier?

Thanks,
Seth Shields
Julius Blum, Inc.

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