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Why does my (RetrieveDuplicatesResponse)localContext.OrganizationService.Execute(request) always return zero count?

Hi,

My CRM plugin needs to find if there is any duplicate records, so I use the following codes, basically I use two fields ("dev_claimnumber" and "dev_adminstratorstatus") as key to find if there is any duplicated records.

I know there is duplicates record already, but these codes does not work, the response.DuplicateCollection.Entities.Count always return 0, which it should be equaled to 1.

Any anybody help me to find what is wrong with my codes? or should I use other object or class to find the duplicated records? thanks a lot,

Peter

-----------------------------------------------------------

string EntityLogicalName = "dev_accountinfo";
Entity statusEntity = new Entity(EntityLogicalName);
            statusEntity["dev_claimnumber"] = entity.Attributes["dev_claimnumber"].ToString(); //single line text field
            statusEntity["dav_adminstratorstatus"] = ((OptionSetValue)entity["dapi_administratorstatus"]).Value; //this is option set field
            var request = new RetrieveDuplicatesRequest
            {
                BusinessEntity = statusEntity,
                MatchingEntityName = statusEntity.LogicalName,
                PagingInfo = new PagingInfo() { PageNumber = 1, Count = 50 }
            };
            var response = (RetrieveDuplicatesResponse)localContext.OrganizationService.Execute(request);
            if (response.DuplicateCollection.Entities.Count == 0) //if there is no duplicate record found, create a record
            {
               localContext.Trace("No duplicates found... Entities.Count:" + response.DuplicateCollection.Entities.Count.ToString());
  //the above code shows Entities.Count:0, even I can see there are duplicate records it should returns 1

********************************************I also tried different codes as follows, but it also return zero of count****************

string EntityLogicalName = "dev_accountinfo";
            Entity statusEntity = new Entity(EntityLogicalName);
            QueryExpression Account = new QueryExpression { EntityName = "dev_accountinfo", ColumnSet = new ColumnSet("dev_claimnumber") };
            Account.Criteria.AddCondition("dev_claimnumber", ConditionOperator.Equal, entity.Attributes["dev_claimnumber"]);
            Account.Criteria.AddCondition("dev_administratorstatus", ConditionOperator.Equal, ((OptionSetValue)entity.Attributes["dapi_administratorstatus"]).Value);

            EntityCollection RetrieveAccount = localContext.OrganizationService.RetrieveMultiple(Account);
            if (RetrieveAccount.Entities.Count > 1)
            {
                localContext.Trace("duplicate records found..." + RetrieveAccount.Entities.Count.ToString());
            } else
            {
                localContext.Trace("no duplicates...");
            }

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