checkSameProduct true OR(AND(NOT(ISBLANK(Product_Category1__c)), NOT(ISBLANK(Product_Category2__c)), Product_Category1__c = Product_Category2__c) , AND(NOT(ISBLANK(Product_Category1__c)), NOT(ISBLANK(Product_Category3__c)), Product_Category1__c = Product_Category3__c), AND(NOT(ISBLANK(Product_Category3__c)), NOT(ISBLANK(Product_Category2__c)), Product_Category2__c = Product_Category3__c)) 请选择不同的产品区分