If the UPP Division rejects a request for unitary effect, any application to reverse its decision must be lodged with the Registry of the UPC, in the language of the proceedings, within three weeks of service of the decision (Rule 97 RoP UPC).
Interlocutory revision is not available for an application to reverse a decision to reject a request for unitary effect (Rule 85(2) RoP UPC; see also UPC_CoA_796/2025, point 17 of the Reasons).