1. First check RFC communication channel is active and working
2. check the user , i.e. is maintained.
a. Determine which rfc, you are going to bebug
2. get the test data for your mapping(valid test data, that rfc takes)
3. check the communication channel we are using and its status and its user name
Now SAP ECC system.
go to any se38/se37 screen utilities-> settings-> debuggin tab
and check user. and activate the debugging for this user.
add break point in the abap code.
Now Again SAP PI message mapping.
Execute the mapping, and now your dubber in sap ecc starts
Now check values in abap variables.
:- ) pdp