MariaDB [ks]> 
MariaDB [ks]> describe gtin;
+----------+--------------+------+-----+---------+-------+
| Field    | Type         | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+-------+
| gtin     | varchar(14)  | NO   | PRI | NULL    |       |
| name     | varchar(255) | NO   |     | NULL    |       |
| codNomen | int(11)      | YES  |     | NULL    |       |
+----------+--------------+------+-----+---------+-------+
3 rows in set (0.00 sec)

MariaDB [ks]> DROP PROCEDURE IF EXISTS `p_gtin`;
Query OK, 0 rows affected (0.00 sec)

MariaDB [ks]> DELIMITER $$ 
MariaDB [ks]> CREATE PROCEDURE `p_gtin`(IN gtin VARCHAR(14))
    -> BEGIN
    -> SELECT Gtin FROM GTIN ;
    -> 
    -> END $$
Query OK, 0 rows affected (0.00 sec)

MariaDB [ks]> DELIMITER ;
MariaDB [ks]> call p_gtin('');
ERROR 1146 (42S02): Table 'ks.GTIN' doesn't exist

MariaDB [ks]> DROP PROCEDURE IF EXISTS `p_gtin`;
Query OK, 0 rows affected (0.01 sec)

MariaDB [ks]> DELIMITER $$ 
MariaDB [ks]> CREATE PROCEDURE `p_gtin`(IN gtin VARCHAR(14))
    -> BEGIN
    -> SELECT gtin FROM gtin;
    -> 
    -> END $$
Query OK, 0 rows affected (0.00 sec)

MariaDB [ks]> DELIMITER ;
MariaDB [ks]> 
MariaDB [ks]> call p_gtin();
ERROR 1318 (42000): Incorrect number of arguments for PROCEDURE ks.p_gtin; expected 1, got 0
MariaDB [ks]> call p_gtin('');
Empty set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)