The newest flavor of Employee Self-Service (ESS) built using Web Dynpro ABAP (WDA) delivered in EHP5+ allows for streamlined configuration of UI elements compared to previous enhancement packages. Now your PA20/30/40 and ESS screens share more configuration tables, which makes many types of screen changes less painful.
1) Open view V_T591C in TCODE SM30. Scroll down to Infotype 0105, subtype 0020. With the “Long_ID” unchecked, we will proceed to show the screens in PA30 and ESS.