Updated based on changes submitted

Author: KumarVivek

powerapps-docs/developer/model-driven-apps/clientapi/reference/events/onprestagechange.md

@@ -1,7 +1,7 @@
 ---
 title: "OnPreStageChange Event (Client API reference) in model-driven apps in Power Apps| MicrosoftDocs"
-ms.date: 10/10/2019
-ms.service: crm-online
+ms.date: 01/23/2019
+ms.service: powerapps
 ms.topic: reference
 ms.assetid: 
 author: msftman
@@ -16,6 +16,11 @@ search.app:
 
 This event occurs **Before** the stage of a business process flow control changes. This event occurs after the user selects the **Next Stage**, **Move to previous stage** or **Set Active Stage** buttons in the user interface or when a developer uses the `formContext.data.process.moveNext`, `formContext.data.process.movePrevious`, or `formContext.data.process.setActiveStage` methods.
 
+> ![NOTE]
+> The onPreStageChange event is supported only:
+>    - On the Unified Interface.
+>    - For single-entity business process flows; it isn't supported for cross-entity processes.
+
 From within a web resource script registered to the onPreStageChange event, a developer can invoke the following on the executionContext object passed into the web resource script: 
 
 `executionContext.getEventArgs().preventDefault();` 
@@ -31,9 +36,7 @@ An execution context object is passed to event handlers for this event. You can
 - **getDirection**: Returns a string that is either “next” or “previous” to show the direction of the stage change.
 - **getStage**: Returns a stage object. Except when the navigation moves to a new entity, the stage returned represents the destination stage object,that is, the next active stage. When the navigation moves to a new entity, the stage is the stage being navigated from, that is, the previous active stage object. More information: [Stage methods](../formContext-data-process.md#stage-methods).
 
-This client API is only supported on the unified client. The legacy web client does not support this client API.
 
-onPreStageChange is only supported for single entity Business Process Flows. It is not supported for cross-entity processes.
 
 ## Methods supported for this event
 - **formContext.data.process**.[addOnPreStageChange](../formcontext-data-process/eventhandlers/addOnPreStageChange.md) method to add event handlers for this event.