In order to make the modification, you must be identified in PSCP with a digital certificate and validator role . The envelope openings have a special treatment to allow their editing and publication at different times without having to make an amendment.
In the case of setting the dates of the dossiers enabled for the submission of proposals by means of a Digital Envelope, this should not be done by means of an amendment to the tender notice . You must modify and save the envelope opening date in the Digital Envelope Management tab. This action will automatically publish an amendment to the contractor profile, which is identified by the image of an envelope and the reason for the amendment "Opening of envelopes", as shown in the screenshot below:
The envelope opening date in the digital envelope settings can be changed as many times as needed. If the envelopes have already been opened, the envelope opening date should not be changed because the documentation for the open envelope can be accessed through the opening tool.