Merge warning: sub-entity might lose parenting in Dynamics CRM 2011

Problem:
If you are trying to merge two accounts, If master account record does not have a parent account, but the subordinate account record does, then you will get following warning message if you do Merge from CRM UI otherwise if you do Merge from SDK code using MergeRequest class you will get an exception saying that “Exception Message: Merge warning: sub-entity might lose parenting”

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Solution:

If you are doing Merge from CRM UI, after you get above warning message, click on “OK” button to continue the merge.
If you are doing Merge from SDK code using MergeRequest class, you should specify PerformParentingChecks property to false. This property used to check if the parent information is different for the two entity records. If it is true it will check the parent information is different for the two entity records.

Sample code is here:

 // Merge Accounts
        public void MergeAccounts(Guid masterAccountId, Guid subOrdinateAccountId)
        {
            try
            {
                //Create CRM Connection        
                IOrganizationService crmConnection = GetCRMConnection();

                //Create the target for the request.        
                EntityReference target = new EntityReference();

                //Id is the GUID of the account that is being merged into.        
                //LogicalName is the type of the entity being merged to, as a string        
                target.Id = masterAccountId;
                target.LogicalName = "account";

                //Create the request.        
                MergeRequest merge = new MergeRequest();

                // SubordinateId is the GUID of the account merging.    
                merge.SubordinateId = subOrdinateAccountId;
                merge.Target = target;
                merge.PerformParentingChecks = false;
                Entity updateContent = new Entity("account");
                var cols = new ColumnSet(new[] { "primarycontactid", "websiteurl", "telephone1", "fax", "emailaddress1" });

                //Get Master Account Primary Contact,Website,Phone,Fax,Email
                var masterAccount = crmConnection.Retrieve("account", masterAccountId, cols);

                //Get Subordinate Account Primary Contact,Website,Phone,Fax,Email
                var subOrdinateAccount = crmConnection.Retrieve("account", subOrdinateAccountId, cols);

                //If PrimaryContact,Website,Phone,Fax,Email fields data are populated on the Subordinate Account and NOT populated on the Master Account. updated these Subordinate account values to the Master record.                  
                if (!masterAccount.Contains("primarycontactid") && subOrdinateAccount.Contains("primarycontactid"))
                    updateContent.Attributes.Add("primarycontactid", new EntityReference("contact", subOrdinateAccount.GetAttributeValue<EntityReference>("primarycontactid").Id));

                if (!masterAccount.Contains("websiteurl") && subOrdinateAccount.Contains("websiteurl"))
                    updateContent.Attributes.Add("websiteurl", subOrdinateAccount.Attributes["websiteurl"]);

                if (!masterAccount.Contains("telephone1") && subOrdinateAccount.Contains("telephone1"))
                    updateContent.Attributes.Add("telephone1", subOrdinateAccount.Attributes["telephone1"]);

                if (!masterAccount.Contains("fax") && subOrdinateAccount.Contains("fax"))
                    updateContent.Attributes.Add("fax", subOrdinateAccount.Attributes["fax"]);

                if (!masterAccount.Contains("emailaddress1") && subOrdinateAccount.Contains("emailaddress1"))
                    updateContent.Attributes.Add("emailaddress1", subOrdinateAccount.Attributes["emailaddress1"]);

                merge.UpdateContent = updateContent;

                // Execute the request.   
                MergeResponse mergeRes = (MergeResponse)crmConnection.Execute(merge);
            }
            catch (Exception ex)
            {
                //Throw the exception        
                throw ex;
            }
        }