Processing Acknowledgment Messages

Hi All,

I have the following async scenario:

SAP R/3-IDOC -> SAP XI -> http adapter-cxml -> Marketplace

Now I am getting an acknowledgment back from the marketplace and I do not know how to process it. The message I got is:

No receiver agreement found for sender BURNS,EIO_PurchaseOrder to receiver 0000170032,CE1402,http://sap.com/xi/XI/Message/30,Acknowledgment

Can somebody help me?

Cheers,

Frank