In AMT is the push a button which needs to lead to a PM order in SAP.
In that case AMT is the consumer and SAP is the provider (service). So instead of creating a consumer proxy in soamanager you need to create a service/endpoint in soamanager.
The RFC function module (if no BAPI exist already, I think there is) is the abap code that creates the order after the web service call.
So create or find this function module/BAPI. Create a webservice out of this function module and configure the service in SOAMANGER (AS a service/endpoint NOT as a consumer proxy).
Now send the wsdl from soamanager to AMT so they can implement the webservice call.
That is it.
Peter