get_party.php - L-15   You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'GROUP BY product_id
            ORDER BY num, name' at line 7  SQL:SELECT product_id,
                (SELECT CONCAT(num, ' - ', name) FROM dic_products WHERE id=product_id) as name,
                (SELECT doc_num_int FROM doc_whinv WHERE id=whinv_id) as num,
                IF(SUM(IF(qty<0, -1*qty, 0))=0, '', MAX(IF(qty>0, '2000-01-01',exp_date))) as exp_date,
                SUM(IF(qty<0, -1*qty, 0)) as keldi, SUM(IF(qty>0, qty, 0)) as qty,  SUM(qty) as ost
            FROM trs_whmove WHERE wh_id=3 AND (SELECT doc_num_int FROM doc_whinv WHERE id=whinv_id)=
            GROUP BY product_id
            ORDER BY num, name