Start_day_not_null true DataMigration_Flag__c == false && IsChanged(Select_Time__c) && Not(Isblank(Select_Time__c)) && ISBLANK(Rental_Apply_Equipment_Set__r.Rental_Start_Date__c) && NOT(Rental_Apply_Equipment_Set__r.Cancel_Select__c) Asset__c [备品预计出货日]不能为空