Not able to use External Id of an Account on Contact Upsert through Data Flow

Not able to use External Id of an Account on Contact Upsert through Data Flow

Hi
I am not able to use External Id of an Account on Contact Upsert through Data Flow


Object 'Contact' does not have field 'Account.Legacy_Record_ID__c'.

Can you please share the right configuration for external Id mapping with related objects upsert through data flow ?