title: Workflow "SendAndReceiveActivity" is not calling WCF method
body: <p>Following is the exact flow in my application:
  1) A workflow (.xmalx) has Pick, within that there is Pick branch..
  2) A pick branch has a receive activity - which gets called from an External WCF service with appropriate parameter.
  3) There is a "SendAndReceiveActivity" after the receive activity, wherein Send activity is targeting to an operation in WCF service with the same parameters it received in Receive activity.</p>
  
  <p>3rs step is the place where the things fail.. its just not hitting WCF method.. what could be the reason possible? I have double-checked endpoints, configurations, contracts and everything.. not sure, what I am missing.. 
  Or else, anyone having an idea of how can we debug a WCF call from Workflow?</p>