The Restrict List to Predetermined Values is a checkbox

that indicates whether a value for the parameter must be in

the list of values. For example, if you check Restrict

List to Predetermined Values and the Initial Value does not

match a value in the list of values, an error will be

generated when you accept the Parameter property sheet.

Similarly, if you set a value for the parameter on the

command line or in a command script and it does not match a

value in the list of values, an error will be generated

when the report is run. If you check Restrict List to

Predetermined Values, a list of values will appear in the

runtime parameter form. If you do not check it, a combo

box will appear (i.e., you can enter values as well as

select from the list).