GuiXT checks the date
format. To do so it needs the user's date format and calls up a BAPI via RFC. I
suggest you add an RFC user to the GuiXT configuration with the necessary
authorizations. If you want to avoid the RFC access, you may use
instead of the date
option. The user will then be able to call up the calendar search help with F4,
but GuiXT does not check the format of a date that is entered manually.