If you want to work in Belgium, you will need to get an equivalent recognition of this certificate.
If you want to work in Flanders, or for Flemish employer in Brussels you can apply for an equivalence recognition at NARIC-Flanders.
More information on the application nand the application form: http://naricvlaanderen.be/en/submitting-an-application
In Wallonia the process depends on the sector you want to work in. You can contact the Direction générale de l’enseignement obligatoire Service des équivalences.
For more information: http://www.equivalences.cfwb.be/index.php?id=travaillerenbelgique