Below is my workflow formula for evaluation.I am getting error saying "Error: Syntax error. Missing ')'"
(OR(!(TEXT(PRIORVALUE(Sales_Order_DSR_Status__c)),"Booked"),(!CONTAINS(TEXT(PRIORVALUE(Sales_Order_DSR_Status__c )),"Complete")),(!CONTAINS(TEXT(PRIORVALUE(Sales_Order_DSR_Status__c )),"Terminated"))))