Limit Value List
I have a VL that uses a drop down to lists dates and Activities. For purposes of data entry, I would like to limit the Vl to contain only activities in 2014 for instance. I see no reason all activities for the last few years should populate in there for a person to pick from. I want it to be difficult for someone to go back in time and add someone to an activity.
So how can I limit a Value list to say this year?