Output of Async BS call from JavaScript PR/PM on button Click

Requirement:- Call a BS method async on click of a button from JavaScript post some validations. We have attempted it using ajax call as mentioned in below Oracle doc.

http://docs.oracle.com/cd/E14004_01/books/config_open_ui/customizing12.html

Its working as expected only catch is that we are not able to capture Output from Propset though BS is performing the intended operation.

Output from Siebel BS method:-
Outputs.SetProperty("Status","UpdateSuccess");

Issue:- Error is coming in below step as java script is not able to get property from output property set:-
var updateStatus = oPS1.GetChild(0).GetProperty("Status");