Has anyone had a problem with the group by in Select Sql command. Per the help file My syntax is correct but it keeps erroring out the Group By is invalid. Here is the Syntax

SELECT order_no,client_no;
FROM cr_Assig;
WHERE !cr_assig.check_performed;
AND cr_assig.start_date<=DATE();
AND EMPTY(cr_assig.end_date);
GROUP BY order_no;
INTO CURSOR temp1