I have extended it out to allow for up to one year, but you can change it to anything you want. In SD.IncidentManagement -> Initial Diagnosis model open the Initial Diagnosis dialog component and click on the Interaction Setup tab. Edit the Schedule for Later dialog model, and then find the Schedule Incident form component and edit it. Edit the date picker component to the right of the Postpone Date label, and click on the Configuration tab. You can set the min and max dates there. For the max date I use a dynamic model to set it to the current date + 1 year.