Lease extending from VCO into VCAC

I currently have a workflow that extends a VCAC lease from VCO that expects a type:  vCAC:VirtualMachine.  I am trying to accomplish is passing in the VM name to this workflow with no such luck.  I can select the VM name from the gui when I run the workflow and all is good.  Do any of you have a sample snippet that will accomplish this?

Thank you