What is the effect of dbms_backup_restore.AutoBackupFlag(FALSE)?

I recently díd a TSPITR manualy recalling most of the steps executed during an automatic TSPITR by RMAN.

In particular I executed the RMAN-command "sql 'begin dbms_backup_restore.AutoBackupFlag(FALSE); end;';". At the end I forgot to execute "sql 'begin dbms_backup_restore.AutoBackupFlag(TRUE); end;';". However, in a subsequent archivelog backup an autobackup was started automaticaly.

Now I wonder what was the effect of dbms_backup_restore.AutoBackupFlag(FALSE). Does this flag only work within the RMAN recovery session? Or is it still necessary to call dbms_backup_restore.AutoBackupFlag(TRUE) for some reason?

Obviously the package dbms_backup_restore is not documented. Therefore, it would be nice if somebody knows details.