When unlink template of host and link other template in Zabbix 1.5, appear this:
# Array to string conversion[/home/zabbix/zabbix-1.5/frontends/php/include/db.inc.php:448]
# Invalid argument supplied for foreach()[/home/zabbix/zabbix-1.5/frontends/php/include/triggers.inc.php:1471]
# Trigger 'Status' updated for host '6500-C02'
# Array to string conversion[/home/zabbix/zabbix-1.5/frontends/php/include/db.inc.php:448]
# Invalid argument supplied for foreach()[/home/zabbix/zabbix-1.5/frontends/php/include/triggers.inc.php:1471]
# Trigger 'Status' updated for host '6500-C02'