Belgium bureaucracy rules

Last year we got a letter from Brussels bureaucrats to invite our son to school test since they assumed he was in home school.Apparently for them internationally recognized school that has been operating for over 50 is not enough...

Well, we informed the school and since we were not the only ones, the school took over and settled it with the authorities. Or so we thought.

Few days ago we got a letter stating that there has been different inturpitations of the law and now we are obliged to take our son to a test, again due to being at "home school". The funny thing is that the letter was sent to us after we had moved out of the country.

What can make Brussels city not to recognize an international school as an official learning method? Can it be language battle?

...this reminds me of Overijse commune, a Brussels suburb with loads of expats;

An American friend of ours got a letter that she should take Flemish (=Dutch, another official language in Belgium) language lessions or otherwise she would get a fine. Well, this lady damn sure didn´t take any lessions and didn´t get the fine either. Another example of Belgium rules that are there but at the end you don´t need to pay too much attention to them...