as I mention before that I use a copy of (*.DB) prod. files (located in other PC) to import data

So I'm think this is not about the locking issue.. (however...

that's what I tought, but even after I've copy the *.DB files to server (using jobs, so I'm sure nobody using those files.. coz I'm using a copy of prod....

When running the package manually it running fine (maybe coz the user already login to Novell server too I guess..). I use UNC name and path to call our Novell Server...

Check this with your SA, because it seems that you're not member of sqladmin role (this maybe why you can't see all the jobs that running under \Sql Server Agent\Jobs)....