https://www.epo.org/en/node/how-do-i-0

How do I prove activity according to Article 11(2)(a)ii) REE and to what extent can national patent applications be taken into account?

A list of activities should be uploaded together with your enrolment documents. Please use our example.

The Secretariat may take activities in proceedings relating to national patent applications and national patents into account. However, the majority of a candidate's activities must pertain to European patents or patent applications.