is there away to know the files related to this addition form
Assuming we know what a "form" is, you can possibly run DSPJOB against the job that is attempting to add the record. Option 14 from the 'Display Job' menu will list any open files. If the program that displays the form is also the program that updates any database files, then the list of files might give names. You can also run DSPPGMREF against involved programs to see if files are listed.
It's not clear what good that will do. Since you restored the library, you can already get a list of database fles. Unfortunately, if we don't know why records aren't added, we don't know what to do with any files.
The joblog messages from the job that fails to add records are needed.
no i dont have source code