Could not find code page for receiving system

Hi

I am triggering an Idoc to the external Biztalk server. I am using SAP ECC 6.0, the status is 02 and showing an error like "IDoc: 0000000000908938 Status: Error passing data to port, Could not find code page for receiving system" . When we triggering idocs from 4.7 EE, it was working fine.

Can anyone please tell me the reason why it is throwing an error.

Regars

Praveen