LastMContract_Gap__c false Maintenance_Contract__r.Contract_Start_Date__c - IF( LastMContract__r.RecordType_Name__c = '多年保修合同',Asset__r.Guarantee_period_for_products__c , LastMContract__r.Contract_End_Date__c) BlankAsZero 上一期合同空白期 18 false 0 false Number false