Error 14274: Cannot add, update, or delete a job (or its steps or schedules) that originated from an MSX server.
If an MSX server has been decommissioned, renamed or is unrecoverable you have a genuine need to override this message. Providing you have permissions on the local server, you can update the entries in msdb directly.
This query updates all jobs, making their 'owner' (originating_server). the local server.
UPDATE msdb.dbo.sysjobs SET originating_server = CONVERT(nvarchar, SERVERPROPERTY('servername')) WHERE originating_server <> CONVERT(nvarchar, SERVERPROPERTY('servername'))
Once run, you can update the jobs once more.
ref : MSX Error