I want to fire validation rule when opportunity stage is moving from Customer Intake to Opps Planning.
When opportunity stage change it should check that Account.Mask_Manufacturer_Model__c is not null when Respiratory__c =true.
What i have done so far is as below any idea how can i achieve that?
IF(ISPICKVAL(StageName ,'Opps Planning' ),
ISBLANK( Account.Mask_Manufacturer_Model__c ), Respiratory__c =true)