If the check box Return icon is checked, this field makes it possible to define the function to which the user will be connected after doucle-clicking on the icon enclosed to the message.
If the return function is of the object type, the function should only be entered if it is different from the source object.
In the case of a Manual Workflow, the function code is compulsory if the return function is enclosed (there cannot be any default value in this case).