Unable to add a secondary level subservice to IT services

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• pg_query() [<a href='function.pg-query'>function.pg-query</a>]: Query failed: ERROR: insert or update on table "services_links" violates foreign key constraint "c_services_links_2" ???????: Key (servicedownid)=(2) is not present in table "services".[/usr/share/zabbix/include/db.inc.php:519]

• Error in query [INSERT INTO services_links (linkid,servicedownid,serviceupid,soft) values (1,2,1,0)] [ERROR: insert or update on table "services_links" violates foreign key constraint "c_services_links_2" ???????: Key (servicedownid)=(2) is not present in table "services".]