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I have a junction object which has a master detail relationship to account and market. This junction object can only be created from account. When user clicks new, Account will already be prefilled but user can only add a market if city field on market,which is a multiselect, contains the city selected on the account object otherwise it throws an error. How can i compare two lookup fields on insert?

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You can do this with a validation rule. Your formula for your validation rule will probably be something like

Account.BillingCity <> Market__r.City__c

Edit for multi-select picklist:

NOT(CONTAINS(Market__r.City__c, Account.BillingCity))
| improve this answer | |
  • I should have added that the city field on market is a multiselect hence i was not able to use the validation rules – SfdcNewbie Jul 26 '15 at 14:27
  • You should still be able to do it. See my updated answer. – Daniel Hoechst Jul 26 '15 at 14:36

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