key - Specified character(usually a special character) for the attribute connected to the LOV. Logic related to specific character is already written in server side
wildcard - A limited functionality of freeinput where the users can specify special inputs which don't exist in the reference table but need to be shown in LOV
wildcard - A limited functionality of freeinput where the users can specify special inputs which don't exist in the reference table but need to be shown in LOV