Opp_Changed_Field__c
    IF(Isblank(Change_To_Opportunity__c), '',
IF(not(text(Change_To_Opportunity__r.Opportunity_stage__c) = text( StageName__c ))
    , '询价阶段发生了变化',
IF(not(text(Change_To_Opportunity__r.Close_Forecasted_Date__c) = text( Close_Forecasted_Date__c ))
    , '预测签约日发生了变化',
IF(not(text(Change_To_Opportunity__r.Dealer_Final_Price__c) = text( Amount__c ))
    , '医院合同金额发生了变化',
IF(not(Change_To_Opportunity__r.Wholesale_Price__c= OCMSale_Price__c )
    , '订货金额发生了变化',
      '没有变化'
)))))
    false
    IF(Isblank(Change_To_Opportunity__c), '',
IF( ISBLANK(IF(not(text(Change_To_Opportunity__r.Opportunity_stage__c) = text( StageName__c ))
    , '询价阶段;','')&
IF(not(text(Change_To_Opportunity__r.Close_Forecasted_Date__c) = text( Close_Forecasted_Date__c ))
    , '预测签约日;','')&
IF(not(Change_To_Opportunity__r.Wholesale_Price__c= OCMSale_Price__c )
    , '订货金额;','')) ,
      '没有变化',
IF(not(text(Change_To_Opportunity__r.Opportunity_stage__c) = text( StageName__c ))
    , '询价阶段;','')&
IF(not(text(Change_To_Opportunity__r.Close_Forecasted_Date__c) = text( Close_Forecasted_Date__c ))
    , '预测签约日;','')&
IF(not(Change_To_Opportunity__r.Name= Name)&&(OCM_Change_To_Opportunity_Flg__c <> true) ,'询价名称;','' ))
)
    BlankAsZero
    
    false
    false
    false
    Text
    false