Hi J.H ,
To create a scenario for the first time using a specific idoc you need to import the same from R/3 system. Secondly import of the idoc into PI is also necessary if idoc structure has undergone changes in r/3 System. In both of above cases, only internal import of idoc metadata using transaction IDX2 will not solve the purpose. Please discuss connection problem with target system
with BASIS team/ Network Team.
Regards
Anupam