Pursuant to Rule 16.1 UPCARoP, the Registry first examines whether there is an opt-out for the patent in suit. If the patent proprietor declared an opt-out, the Registry immediately informs the claimant who must then change or withdraw the action. Pursuant to Rule 16.2, the Registry then checks whether the Statement of claim is formally complete. If there are any deficiencies, the Registry requests the claimant to correct the Statement of claim. The Registry must inform the claimant that a decision by default (Rule 355) is possible. If the claimant does not correct the deficiencies within 14 days or does not pay the fee for the action within said 14 days, the judge rapporteur dismisses the action by default (Rule 16.4). The claimant may, however, appeal the decision by default pursuant to Rule 356.