Скачать или смотреть Admin Intermediate Formulas and Validations Create Validation Rules

Create a Validation Rule
Create a validation rule that displays an error message and prevents users from creating or updating a contact for an account if the contact and account have different zip codes. Allow creating and updating contacts that have no associated account.
Create a validation rule:

Operator: AND return true if both conditions are true
Define the two conditions that, combined, will show the error message:
The contact is associated with an account id
The contact mailing zip code is different than the account shipping zip code

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