I do not think that it is compulsory if you work as an EPA (European Patent Attorney, Europäischer Patentvertreter) representing before the EPO only.
If you are a patent attorney from a EEA (european economic area) country (EEA patent attorney) working in Germany, things might be different. I assume that the Patentanwaltskammer (German chamber of patent attorneys) can help you to find out.
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