With the exception of annexes, any document filed after the request for unitary effect must be duly signed. The signatory's name and position must be clear from the signature. If the signature is missing on a document, the UPP Division will invite the party concerned to correct the deficiency within a time limit to be specified by the EPO. If signed in due time, the document retains its original date of receipt; otherwise, it is deemed not to have been received (Rule 20(2) UPR in conjunction with Rule 50(3) EPC, which applies mutatis mutandis pursuant to Rule 20(2) UPR).
EPO Form 7038 is available in EPO Online Filing and Online Filing 2.0 (see 8.1.2 7.1.2) and can be downloaded in PDF from the EPO website (epo.org) for use as the letter accompanying subsequently filed documents.