HttpAdapterException: STATUS_CODE_NOT_OK in multi-mapping

Hi,

I have a multi-mapping (message splitting) which is creating multiple files from a single file and then those files need to be post to a URL (not SOAP but HTTP only). The target system is SAP Aii. As traditional HTTP receiver adapter does not support multi-mapping, I have used HTTP_AAE. But it is giving the below error..

Exception caught by adapter framework: STATUS_CODE_NOT_OK-OK

Delivery of the message to the application using connection HTTP_AAE_http://sap.com/xi/XI/System failed, due to: com.sap.engine.interfaces.messaging.api.exception.MessagingException: com.sap.aii.adapter.http.api.HttpAdapterException: STATUS_CODE_NOT_OK-OK

I have also set the content type with text/xml, still same error. I am using PI 7.3 and for this HTTP_AAE it is successfully processing single file.

How the multiple file can be posted in Aii system?

Thanks,

Anirban