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What does the expert's report say, and have you signed it?
Owner/landlord can demand as much as he thinks will cover the cost of the damage as set out in the etat des lieux.
You can always disagree and get a 2nd opinion for the etat des lieux but that would also be at a cost where the original entry etat des lieux would be compared with the state of the property at exit.
relative page not in English: http://www.belgium.be/fr/logement/location/litiges/