IDOC is failing to post at receiver

Hi Friends

Here I have a scenario where PI needs to post IDOCs to an SAP certified system(not an ABAP system), so it was an TCP/IP connection. When we done a test run it was successfully executing at Moni where as the IDOC is failing to receive at the target system end.In SM58 it is showing a status of IDOC error occured.

Please guide us with the reasons for failure or with troubleshoot steps.The test connection from SM59 from both the systems are working fine.

Regards

Suman