function readOnly(count){ }
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AND( NOT( ISBLANK( AccountId ) ), MailingPostalCode <> Account.ShippingPostalCode )
AND( NOT(ISBLANK(AccountId)), MailingPostalCode != Account.ShippingPostalCode )
You have to make Validation Rule on Contact Object
(See below Screenshot)
Hope it will be helpful for you, please mark this answer as best if it really helps you .
Regards,
Suraj
1) https://developer.salesforce.com/forums/?id=906F0000000Ar9hIAC
2) https://developer.salesforce.com/forums/?id=906F0000000BIQlIAO
You can also try like below
Let us know if this will help you