1. The WD component that needs to be called on click of F4 should implement the interface IWD_VALUE_HELP.
2. Creating a component usage for the above component in your application component that contains the input field for F4.
3. Attach the component usage to the context attribute. In this case, for the input help mode choose free (either when creating the attribute or later in its properties table) and specify the respective component usage.
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