title: Restrict entries in Calendar on F4 on date field, to get only year and month?
body: <p>My requirement is, I have one select-options of type <code>sy-datum</code> on the selection screen.</p>
  <p>Whenever a user presses F4 or uses the input help it will show a calendar. After double clicking the calendar, I should get the date in YYYYMM format that means only 6 digit date.</p>