When I remove item prototypes in a discovery template the discovered items on the hosts get deleted but in the server log I get the following sql statement errors:

1447:20131024:090856.726 [Z3005] query failed: [1452] Cannot add or update a child row: a foreign key constraint fails (`zabbix`.`item_discovery`, CONSTRAINT `c_item_discovery_2` FOREIGN KEY (`parent_itemid`) REFERENCES `items` (`itemid`) ON DELETE CASCADE) [insert into item_discovery (itemdiscoveryid,itemid,parent_itemid,key_) values (22073,50131,39277,'IF-MIB.ifOutNUcastPkts.["

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