Erro numa procedure

[Carlos roquette]

Boas!
Está dando erro de compilação nessa procedure e sou inexperiente no mysql.

CREATE PROCEDURE rewards_report (
IN min_monthly_purchases TINYINT UNSIGNED
, IN min_dollar_amount_purchased DECIMAL(10,2)
, OUT count_rewardees INT
)
LANGUAGE SQL
NOT DETERMINISTIC
READS SQL DATA
SQL SECURITY DEFINER
COMMENT 'Provides a customizable report on best customers'
proc: BEGIN

DECLARE last_month_start DATE;
DECLARE last_month_end DATE;

/* Some sanity checks... */
IF min_monthly_purchases = 0 THEN
SELECT 'Minimum monthly purchases parameter must be > 0';
LEAVE proc;
END IF;
IF min_dollar_amount_purchased = 0.00 THEN
SELECT 'Minimum monthly dollar amount purchased parameter must be > $0.00';
LEAVE proc;
END IF;

/* Determine start and end time periods */
SET last_month_start = DATE_SUB(CURRENT_DATE(), INTERVAL 1 MONTH);
SET last_month_start = STR_TO_DATE(CONCAT(YEAR(last_month_start),'-',MONTH(last_month_start),'-01'),'%Y-%m-%d');
SET last_month_end = LAST_DAY(last_month_start);

/*
Create a temporary storage area for
Customer IDs.
*/
CREATE TEMPORARY TABLE tmpCustomer (customer_id SMALLINT UNSIGNED NOT NULL PRIMARY KEY);

/*
Find all customers meeting the
monthly purchase requirements
*/
INSERT INTO tmpCustomer (customer_id)
SELECT p.customer_id
FROM payment AS p
WHERE DATE(p.payment_date) BETWEEN last_month_start AND last_month_end
GROUP BY customer_id
HAVING SUM(p.amount) > min_dollar_amount_purchased
AND COUNT(customer_id) > min_monthly_purchases;

/* Populate OUT parameter with count of found customers */
SELECT COUNT(*) FROM tmpCustomer INTO count_rewardees;

/*
Output ALL customer information of matching rewardees.
Customize output as needed.
*/
SELECT c.*
FROM tmpCustomer AS t
INNER JOIN customer AS c ON t.customer_id = c.customer_id;

/* Clean up */
DROP TABLE tmpCustomer;
END//

DELIMITER ;

se alguém puder me ajudar agradeço muito.