[ABAP] SAP User-Passwort auf Gültigkeit prüfen, Inhalt eines Eingabefeldes als Passwortfeld darstellen

PARAMETERS: p_usr TYPE sy-uname DEFAULT sy-uname.
PARAMETERS: p_pwd TYPE rsyst-bcode.

AT SELECTION-SCREEN OUTPUT.
  LOOP AT screen INTO DATA(screen_wa).
    IF screen_wa-name = 'P_PWD'. " wenn Eingabeparameter P_PWD
      screen_wa-invisible = 1.   " dann Anzeige als Passwortfeld
      MODIFY screen FROM screen_wa.
    ENDIF.
  ENDLOOP.

START-OF-SELECTION.
  CALL FUNCTION 'SUSR_LOGIN_CHECK_RFC'
    EXPORTING
      bname                  = p_usr
      password               = p_pwd
    EXCEPTIONS
      wait                   = 1
      user_locked            = 2
      user_not_active        = 3
      password_expired       = 4
      wrong_password         = 5
      no_check_for_this_user = 6
      internal_error         = 7.

  CASE sy-subrc.
    WHEN 0.
      WRITE: / 'Password OK'.
    WHEN 1.
      WRITE: / 'wait'.
    WHEN 2.
      WRITE: / 'user_locked '.
    WHEN 3.
      WRITE: / 'user_not_active'.
    WHEN 4.
      WRITE: / 'password_expired'.
    WHEN 5.
      WRITE: / 'wrong_password '.
    WHEN 6.
      WRITE: / 'no_check_for_this_user'.
    WHEN 7.
      WRITE: / 'internal_error'.
    WHEN OTHERS.
      WRITE: / 'Other error.'.
  ENDCASE.