There are a number of things to keep in mind when working with parameter fields:
Parameter fields support the following data types:
Boolean: Requires a true/false answer.
Example: Include planned budget numbers in the summary?
Currency: Requires a dollar amount.
Example: Display customers with sales over XXXXX.
Date: Requires an answer in a date format.
Example: Enter the start and end dates of the quarter.
DateTime: Requires both date and time.
Example: Display statistics for 07/04/1999 between 1:00pm-2:00pm.
Number: Requires a numeric value.
Example: Enter the customer identification number.
String: Requires a text answer.
Example: Enter the region.
Time: Requires an answer using a time format
Example: Display the total number of calls from 1:00pm-2:00pm.
You can create a list of values from which users can choose the parameter value rather than having them enter it manually. Lists of values are static (embedded in each report).
A parameter field does not have to be placed in a report in order to be used in a record or group selection formula. You create the parameter field and then enter it in your formula as you would any other field.