I am checking whether Order OwnerId is changed or not in Process buider.If Changed update related records.
But getting below error when Order.Close_Date__c is updated through Workflow field update when Order.order_Status__c is set to Closed.
The flow failed to access the value for myVariable_old.OwnerId because it hasn't been set or assigned.
Here is the condition in process builder
It looks like Is Changed operator is added recently in Spring 15.
Is it something related to this idea which says process builder - Access to Owner Fields