Hello Bernd,
This is not a bug, but a javascript control to secure the component. But if you really want to allow this character, you can edit the files /administrator/components/com_neorecruit/screens/admin.offer_form.html.php on line 33, and /components/com_neorecruit/screens/front.offer_form.html.php on line 33 too, and replace the line by this one :
var regexp = /\>|\<|\\|\*|\@|\[|\]|\{|\}|\||\#/;
A new version for Joomla 1.5 will be released in a few days, and we will publish in the same time the new roadmap and the changlog of the component.
Regards,