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Validation RuleFrom Setup, open the Object Manager and click Account object.In the left sidebar, click Validation Rules.Click New.Enter the required properties for your validation rule.Provide Error message to be displayed.Click Check Syntax to check the formula used.Click Save to finish.Jun 1, 2019

Validation rules are used to validate the information entered in a Web form component field against that rule. For example, a Numeric value validation rule ensures that user-entered values are numeric. Alpha characters or symbols would result in a validation error message.

Validation rule requirementClick on Setup.Go to Quick Find and enter Object.Choose the object.Under the Validation Rules section, click on New.Enter a Rule Name.Enter an Error Condition Formula, you can use ISBLANK or ISNULL to check that the field is not empty.Enter an Error Message.Select an Error Location.More items...

Field Validation Rule You can use a field validation rule to specify a criterion that all valid field values must meet.Restrictions on types of characters to be entered in a field may be easier to do with an Input Mask. For example, a date field might have a validation rule that disallows values in the past.

Different ways to make field mandatory :Make the field Required at the time of field creation by checking the Required check box.Make the field Required through Page Layout by checking the Required checkbook in Field Properties.Validation Rules can also be used to make the field mandatory.More items...

The solution to these problems is form field validation. Field validation is an automated process of ascertaining that each field contains the correct value before the form is accepted.

If a field is invisible to a user and validation rule says that the record cannot be saved without entering value for that field, then that particular user would never be able to save a record for that object.