Hi Praveen,
What PI version you are in? This is a well know issue with HTTP_AAE adapter and if you are getting status code ranging from 200 to 207, you will have to update your SP.
We had similar issue with SAP PI 7.31 - SPS05, and SAP provided special patch for us as it was not reported by any customer for SP05. This error is applicable for SPS04, 06, 07, 08.
Raise an OSS and get support from SAP.
Regards
Aashish Sinha