InstallDate__c nullvalue(InstallDate_text__c,Nullvalue(nonyushohin__r.InstallDate, nullvalue(nonyushohin__r.Posting_Date__c,nonyushohin__r.Asset_day__c))) false nullvalue(InstallDate_text__c,Nullvalue(nonyushohin__r.InstallDate__c, nonyushohin__r.Asset_day__c)) BlankAsZero 购买日期/安装日期(设备) false false false Date