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G N Balakrishna sarmaG N Balakrishna sarma 

AND( NOT( ISBLANK( AccountId ) ), MailingPostalCode__c <> Account.ShippingPostalCode )

ANUTEJANUTEJ (Salesforce Developers) 
Hi BalaKrishna,

Can you try AND( NOT(ISBLANK(AccountId)), MailingPostalCode != Account.ShippingPostalCode )

as mentioned in: https://developer.salesforce.com/forums/?id=906F0000000BIQlIAO

Let me know if it helps you and close your query by marking it as solved so that it can help others in the future.  

Thanks.
Yuri Caballero 1Yuri Caballero 1
Hi BalaKrishna,
Mailing Zip Code on Contact object is a standard field not a custom field.  Use: MailingPostalCode