How to call a Orchestration by a E1 Page

I have searched hi and low and I can not find a solution. We are on EnterpriseOne 9.2.3. I have tried everything that the classic E1 Page recommend. I have done everything and I keep getting the following error?

 Cannot convert value Not Passed to type String for required input BranchPlant

My input to the callAISOrchestration() is

  var input ='{inputs : [{name : "BranchPlant", value :' + document.getElementById("branch").value + '}]}';