ABAP Proxy how to catch exception send by PI Interface ?

Dear XI Expert,
I have Synchronous ABAP Proxy interface with exception. How to cacth the exception generated by PI ?
The standarc exception handler is :
CATCH cx_ai_system_fault INTO lo_system_fault.
        WRITE:/ 'System fault:'.
        WRITE:/ lo_system_fault->errortext.
        WRITE: 'While trying to update monitoring status in PI'.
        RETURN.
CATCH cx_ai_application_fault .
        WRITE:/ 'Application fault encountered. While trying to update monitoring status in PI'.
        RETURN.
i have another 2 additional exception generated by the sender :
FM_JPROXY_READFILE_FILENOTFOUND
FM_JPROXY_READFILE_IO_ERROR
Please advise how to add this to to my exception handling.
Thank You and Best Regards
Fernand

it does not seem to be a cx_ exception but try to catch the root CX_ROOT and see if it caught

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