Anybody know syntax of sage line 50 query?

how can I write sage line50 database conidtion sql query?

when i write this syntax, get error msg of column not found.
'SELECT c.stock_cat_name, a.stock_code, c.description, a.date,
IIF(MID(a.type,2,1)="I",SUM(a.quantity),0) AS iqty,
IIF(MID(a.type,2,1)="O",SUM(a.quantity),0) AS oqty
FROM stock_tran AS a LEFT JOIN stock AS c ON c.stock_code=a.stock_code
WHERE a.date>=[from_date] And a.date<=[to_date]
GROUP BY c.stock_cat_name, a.stock_code, c.description, a.date,
MID(a.type,2,1)
ORDER BY c.stock_cat_name, a.stock_code, a.date, MID(a.type,2,1)'

rashesh