Problem in getting info in R/3

Hi guys,

I have a scenario like this R/3 > XI > AS400

In r3 I imput a parameter and thanks to this parameter I get more info from a table in AS400

When I check in XI in XML message monitor it is ok , I have all the requested field from AS400

The problem is between XI and R/3 , I can't get the data back in my abap program...

CREATE OBJECT lo_clientProxy.

CALL METHOD lo_clientProxy->execute_synchronous

EXPORTING

output = ls_request

IMPORTING

input = ls_response.

CATCH cx_ai_system_fault INTO lo_sys_exception.

ENDTRY.

I should have all the info in ls_response but all the field are blank...

Does anybody know Where can be the problem??