Using Input Masks to Set Up Field Formats
Some forms contain fields in which you can specify an input mask, or 
 template, that determines the format used to display or enter values in 
 the field. For information about input mask characters, see Input 
 Mask Property. 
	NOTE: In specifying an input mask, 
	 consider whether a null value is allowed in a field. To prevent the 
	 system from attempting to save an unspecified value in a decimal field 
	 bound to a table column that does not allow null values, use the mask 
	 character 9. An input mask that contains 9 defaults 
	 to 0 if no value is specified in the field, and the value 0 can be 
	 saved. 
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