argh!
Can\'t stand it that i can\'t figure it out myself....
i\'ve used this in the formatting of a number in my report:
\'€\' #,0.00;(\'€\' #,0.
You can use the format € #,0.00 and set the language of your report to de-DE by clicking outside of the report area and in the right properties pane go to Localization -> Language.