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You can constrain the values allowed in a numeric field by using rules. To add a rule, click Add… on the Constraints tab of the element properties. In the Validation Rule: Select Rule Definition window, double-click Create New Rule… in the Interval list. The Interval Rule dialog box opens.

The Interval Rule dialog box.

  • Rename… – Renames the rule. Enter a new name and click OK.
  • Span: from … to – Manages the list of intervals:
    • Add – Adds the entered interval to the list.
    • Remove – Removes the selected interval from the list.
  • Error message – Select Generate automatically to generate the error message text automatically, or clear it to enter custom text.