PeriodOfUse_Old_F__c false IF(NOT(ISBLANK(RNDAssert__r.Consumable_Guaranteen_end_old__c)),RNDAssert__r.Consumable_Guaranteen_end_old__c,RNDAssert__r.Consumable_Guaranteen_end__c) BlankAsZero 使用期限(修改前) false false Date