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Your data is only valuable if it is correct. Database Services allow you to impose broad limits on data values through the use of field object types and relationships, but you may want to create more complex validation routines to insure that all incoming data is correct.

You can define one or more validation rules on an object. The rules are expressions or formulas that evaluate to True or False when triggered by an attempt to save a new or modified record. If a validation rule evaluates as True, the data action which triggered the rule is stopped, and an error message, defined as part of the rule, is displayed to the user.

• Overview of data validation.