Very new to SFDC so please excuse me if I don't use the right terminology.
I have a date field on a form. It shows both historical data and new/current data. The business rule is that if the user can only change the date to a "future" date so the picklist only shows future dates. But when a historical record is loaded, it would need to display the value but it can't since it is not in the picklist.
How is this sort of thing handled? Can the "odd one out" value be shown in the picklist (and saved to the back-end) even though it is technically not part of the valid values for the list?