You can set an entry field to require numbers only. Users will be unable to enter non-number characters.
To create a number-only entry field:
Do one of the following:
In the Title Explorer, double-click the graphic of the entry field element.
In the Title Explorer, right-click the graphic of the entry field element and select Properties.
In the Title Explorer, select the entry field element and press Enter.
In the work area, double-click the entry field element.
In the work area, right-click the entry field element and select Properties.
In the work area, select the entry field element and press Enter.
The Properties ribbon is displayed.
In the Behaviors group, enable the Number check box.
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