Webdynpro and FPM events link
The following diagram shows the sequence of different events triggered in Webdynpro and FPM. It is presumed that if you have to implement FPM then you would have implemented interface – IF_FPM_UI_BUILDING_BLOCK. In this example we also implement the interface IF_FPM_OIF_CONF_EXIT. Depending on the FPM component type you could implement IF_FPM_GAF_CONF_EXIT or IF_FPM_OVP_CONF_EXIT.
Here you perform an action on a webdynpro view and the event WDDO_BEFORE_ACTION and ON_ACTION gets triggered. ON_ACTION method will take you to the FPM methods in the sequence as shown in the diagram and the control is passed back to webdynpro view.