Data lost in Web Service, how do I debug lost XML data?

Hello,

I am new to the entire web service technology so excuse me if my question is not clear.

I just published a Z function module as a web service. This went well and I am able to call the web service from my external system (non SAP). From my external system I am passing my XML document to the web service with the necessary data to be passed to the function module.

The problem is that when I set an external breakpoint in the function module, I notice that all incomming data structures are empty. How can I debug my web service to find the place where my data is being "lost"?

I am running netweaver 700 SP 17.

Any help would be greatly appreciated!