Idocs not processed automatically in BW

Dear Experts,

I have a scenario here where I extract data from source system via process chains.

The source system job completed and in BW, the outbound idocs resulted in the following Status (02).

02 Error passing data to port 1

In the infopackage message dialog, I got the message as

Could not find code page for receiving system

Errors have been reported in Business Information Warehouse during the IDoc update:

In order to resolve this, I'm manually processing the idoc using program RBDAGAIN.

Note: This issue occurs only when I trigger the infopackage via process chains.

How do I rectify this error so that the idocs are processed automatically in BW?

Br, Harish