SQL & PL/SQL

Hi !

EDIT:

I've narrowed this issue down to "dbms_backup_restore.restoreDataFileTo(6, 'E:\oracle\oradata\mydbname\USERS01.DBF', 0, 'USERS');" being the problematic command.

I'm running a script that restores some data files using the dbms_backup_restore.restoreDataFileTo function. The script used to run fine in 11g and 12.1. Now, however, running it on 12.2, I'm getting :

declare
*
ERROR at line 1:
ORA-19583: conversation terminated due to error
ORA-06512: at "SYS.X$DBMS_BACKUP_RESTORE", line 6906
ORA-19870: error while restoring backup piece
E:\ORACLE\ORA12\ASSISTANTS\DBCA\TEMPLATES\SEED_DATABASE.DFB
ORA-19615: some files not found in backup set
ORA-19613: datafile 6 not found in backup set
ORA-06512: at "SYS.X$DBMS_BACKUP_RESTORE", line 6900
ORA-06512: at line 16

The script I'm running is:

connect SYS/mypass as SYSDBA
set echo on;
spool E:\oracle\admin\mydbname\create\rmanRestoreDatafiles.log
startup nomount;
set echo off;
set serveroutput on;
select TO_CHAR(systimestamp,'YYYYMMDD HH:MI:SS') from dual;
variable devicename varchar2(255);
declare
omfname varchar2(512) := NULL;
  done boolean;
  begin
    dbms_output.put_line(' ');
    dbms_output.put_line(' Allocating device.... ');
    dbms_output.put_line(' Specifying datafiles... ');
       :devicename := dbms_backup_restore.deviceAllocate;
    dbms_output.put_line(' Specifing datafiles... ');
    dbms_backup_restore.restoreSetDataFile;
      dbms_backup_restore.restoreDataFileTo(1, 'E:\oracle\oradata\mydbname\SYSTEM01.DBF', 0, 'SYSTEM');
      dbms_backup_restore.restoreDataFileTo(3, 'E:\oracle\oradata\mydbname\SYSAUX01.DBF', 0, 'SYSAUX');
      dbms_backup_restore.restoreDataFileTo(5, 'E:\oracle\oradata\mydbname\UNDOTBS01.DBF', 0, 'UNDOTBS1');
      dbms_backup_restore.restoreDataFileTo(6, 'E:\oracle\oradata\mydbname\USERS01.DBF', 0, 'USERS');
    dbms_output.put_line(' Restoring ... ');
    dbms_backup_restore.restoreBackupPiece('E:\oracle\ora12\assistants\dbca\templates\Seed_Database.dfb', done);
    if done then
        dbms_output.put_line(' Restore done.');
    else
        dbms_output.put_line(' ORA-XXXX: Restore failed ');
    end if;
    dbms_backup_restore.deviceDeallocate;
  end;
/
select TO_CHAR(systimestamp,'YYYYMMDD HH:MI:SS') from dual;
spool off;
exit;

Has anyone encountered anything like it?

I've also tried changing the first parameter passed to restoreDataFileTo to 1,2,3,4 with the exact same issue.