Previous_consumption_rate__c if(isblank(LastMContract__c), null, if(isblank(LastMContract__r.Contract_Consumption_rate__c), 0, LastMContract__r.Contract_Consumption_rate__c)) false Maintenance_Contract_Asset_Estimate__r.Asset_Consumption_rate__c 首次报价消费率 18 false 2 false Percent