Steps to reproduce:

1. Zabbix frontend displays an error that the discovery rule cant create items with the same key as it already exists, but all the items are created and working see screenshot 550.

Result:
It displays that it:

Cannot create item: item with the same key "tier3.jobs.mssql.dbmenabled[MSSQLSERVER]" already exists.

see screenshot 549
Expected:
Result should be with no error message in the info section like in the screenshot 551 (this was taken on another host)