Rule 93
Precedence of opposition proceedings

(1) The request for limitation or revocation shall be deemed not to have been filed if opposition proceedings in respect of the patent are pending at the time of filing the request. 

(2) If, at the time of filing an opposition to a European patent, limitation proceedings in respect of that patent are pending, the Examining Division shall terminate the limitation proceedings and order the reimbursement of the limitation fee. The reimbursement shall also be ordered in respect of the fee referred to in Rule 95, paragraph 3, first sentence, if the requester has already paid this fee.