ERROR 1227 (42000): Access denied; you need the SUPER privilege for this operation

[Simone Gommaraschi]

Hi,
I created those triggers by root with this syntax

CREATE DEFINER=`userhp`@`%` TRIGGER `trg_acu_insert` BEFORE INSERT ON `tbl_anag_categ_uffici` FOR EACH ROW SET NEW.categid = 1 ;
CREATE DEFINER=`userhp`@`%` TRIGGER `trg_acu_update` BEFORE UPDATE ON `tbl_anag_categ_uffici` FOR EACH ROW SET NEW.categid = 1 ;

Mysql user `userhp`@`%` had this grants
mysql> SHOW GRANTS FOR userhp;
Grants for Userhp@% |
| GRANT USAGE ON *.* TO 'userhp'@'%' IDENTIFIED BY PASSWORD 'XxXxXxXxXx' |
| GRANT ALL PRIVILEGES ON `AppDataHP`.* TO 'userhp'@'%' |

When I try to update record of table tbl_anag_categ_uffici

mysql> update tbl_anag_categ_uffici set nome='test' where objectid = 3 ;
ERROR 1227 (42000): Access denied; you need the SUPER privilege for this operation

I read documentation of grant, trigger , but it's possible that I've not understood something ; )

Can you help me ?

TIA
Simone