Hi Debdatta,
I am a bit confused right now. The function module that you say you have created should be the function module that creates the order. So all code is in there.
Once you have created a webservice out of this function module and configured an endpoint (so NOT a consumer proxy !!!!!!!) you are basically finished.
You give the wsdl from soamanager to the counterpart (AMT) so they now how and where to call the SAP service.
There is nothing else for you to do. There is no proxy to call because you (SAP) are the service provider.
If you need to call a webservice from abap then you would create a consumer proxy and need to call this proxy in your abap code, but that is not the case in your scenario.
I hope I have been clear. Please read my posts carefully, because by your responses it looks to me that you do not know what to do.
You say they have given you the xml data which you need to consume, but that is wrong. You need to give them the wsdl because you are the service provider since you are creating a work order in SAP. There is nothing to give by AMT. You are the leading party and need to give them the wsdl.