Oracle Database Discussions

Hi,
on 10g R2 ,I try to use the RMAN backup files from another data base for my database :

target database Password:
connected to target database: ORCL2 (DBID=728416591)
connected to recovery catalog database

RMAN> catalog start with 'E:\oracle\backup\orcl2';

searching for all files that match the pattern E:\oracle\backup\orcl2

List of Files Unknown to the Database
=====================================
File Name: E:\ORACLE\BACKUP\orcl2\AL_ORCL2_20110404_3_1
File Name: E:\ORACLE\BACKUP\orcl2\CTL_ORCL2_20110404_4_1
File Name: E:\ORACLE\BACKUP\orcl2\DF_ORCL2_20110404_1_1
File Name: E:\ORACLE\BACKUP\orcl2\DF_ORCL2_20110404_2_1

Do you really want to catalog the above files (enter YES or NO)? YES
cataloging files...
no files cataloged

List of Files Which Where Not Cataloged
=======================================
File Name: E:\ORACLE\BACKUP\orcl2\AL_ORCL2_20110404_3_1
  RMAN-07518: Reason: Foreign database file DBID: 703792865  Database Name: ORCL2
File Name: E:\ORACLE\BACKUP\orcl2\CTL_ORCL2_20110404_4_1
  RMAN-07518: Reason: Foreign database file DBID: 703792865  Database Name: ORCL2
File Name: E:\ORACLE\BACKUP\orcl2\DF_ORCL2_20110404_1_1
  RMAN-07518: Reason: Foreign database file DBID: 703792865  Database Name: ORCL2
File Name: E:\ORACLE\BACKUP\orcl2\DF_ORCL2_20110404_2_1
  RMAN-07518: Reason: Foreign database file DBID: 703792865  Database Name: ORCL2

Is there any solution for this error ? Can we define DBID for our database ?
Thank you.