>Hi,
>
>When executing a long SQL Select command I get error "Invalid column name 'GROUP_ID'". I do have the very first column of the SQL Select defined as "MYFIELD AS GROUP_ID" and then I have GROUP BY GROUP_ID at the end of the SQL Select.
>
>Is GROUP_ID a reserved word?

No, AFAIK, but you can not ORDER BY the new field. You should ORDER BY the original field, e.g.

select myField as Group_ID from myTable ORDER BY myField

Obect_ID is a SQL Server function.