Hi Chandra,
Check the ALE configuration at ECC side and also check the message type is maintained or not in the partner profile at ECC side,if your using IDOC_AAE the RFC destination should be "T" type.check that one also.
Since your saying that your able to see the idoc if it is Plan Idoc channel,check the InboundRA properties in NWA the local variable value should be TRUE if your using IDOC_AAE channel.