The starting date and end date of the dossier can be modified with an optional ‘Adjust dossier dates’ step or through the ad-hoc activity (three dots at the top right of the dossier and choose ‘New activity’).
However, if a ‘Record agreement’ activity has been used in the dossier, the start and end dates can only be altered through a ‘Change agreement data’ activity (optional or ad hoc).