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Philip BonthaPhilip Bontha 

Dear all,need some help on validation rule.

There are two objects which have master-detail relationship.
Object2:Price__c(MD relationship to Book__c)
on Book__c  i have a picklist field Type__c which have values Yes,No.
On Price__c I have a lookup field (PC__c) to user.
If i select the Type__c as "Yes" on Book__c then in the Price__c the PC__c field can't blank.

Please help on this.
Thanks in advance..!

VinayVinay (Salesforce Developers) 
You can try below snippet.  Kindly provide exact relationship field name and picklist field API names.