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MohiniMohini 

how to make a picklist value required when a formula field value is "None"

I have two Timing 1 field  one is picklisy which is created for user to select manually , Timing 2 field is a formula which  populates if user selects a contract end date.

The users should enter Timing 1 field only when Timing 2 is populated as "None'  (basically when no contract end date is entered , Timing 2 is none ).

How to achieve this ? Help me with the validations please
Sai PraveenSai Praveen (Salesforce Developers) 
Hi Meera,

This seems to be duplicate. But please find the below validation rule.
 
AND(ISPICKVAL( Timing_1__c ,""), Timing2__c ='No')

Let me know if you need further help on it.

If this solution helps, Please mark it as best answer.

Thanks,