Execute Robotic Process Smart Service input nodes not working


I have a Execute Robotic Process inside a process per documentation it says for this node: 


Data tab

Node inputs

When an integration is selected, the integration's inputs will automatically appear as node inputs. If you change the selected integration or the inputs of the selected integration are updated outside the process modeler, the node inputs will be refreshed the next time you view the Data tab.


Problem which I am facing is that in the Robot I have 3 variables, they appears inside the Integration view but does not appears inside the pcoess Node in the Input Data Tab.

Any idea why ?

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