problems with keyboad mapping in XEmacs 21.5.21

Hello list, because SuSE Linux's default is UTF-8, they have put xemacs-21.5.21 (SuSE 10.0) into their Linux dsitribution - as a beta version :-( As I've heard, Xemacs 21.5 can deal with utf-8, and maybe therefore I have problems with my keyboard mapping lisp functions in this version. I'll try to explain it by the LaTeX-mode and the german umlaut characters. In LaTeX, the german umlaut of a is defined as "a. So If I would type the keyboard key for the german umlaut a, I don't want to see this umlaut, I want to get "a instead. To get this, I've first defined in my init.el: (fset 'ae "\C-q42a") and later (local-set-key 'adiaeresis 'ae) This worked fine until the version 21.4. However, with 21.5.21, if I type the umlaut a key, I get only the " (quote) character, and The following error is displayed in the mode line: Wrong type argument: command-event-p, ?a unread-command-event The error never occurs before, and I haven't changed my config file. What must I change? Alexander