Duplicate Check 
Use
This function checks if the external record exists already as a business partner in the SAP CRM system.
Prerequisites
To perform this check, you must have completed the customizing activity Activate Duplicate Check. For more information, see Customizing for Customer Relationship Management (CRM) by choosing Marketing ® External List Management ® Activate Duplicate Check.
Activities
· To execute this step, select the Check for Duplicates option, specify the error and the repeat attribute if applicable, and set the start data.
If you repeat this step after executing the step Maintain Business Partner, all external records for which business partners were created would be marked as duplicates.
The External List Analysis in SAP BW will fail because all business partners created are duplicates.
· Errors can be caused by erroneous external data or other system-related problems.
Errors occurring during the execution of the Duplicate Check step are logged. These errors can be identified if the button next to Check for Duplicates on the Process Steps tab page contains a red icon. Error details can be viewed by clicking this button.
On the People-Centric User Interface (PC UI), you can view the error log on the Process Steps tab page.
During the creation of business partners, records marked as incorrect are not processed.
· Third-party software must be used for duplicate checks. To locate certificated partners, click Software Partner Directory on the http://www.sap.com/partners/software/directory page and select Business Address Services under By Software Category. For more information, access http://service.sap.com/bas to view the Service Marketplace. Click Documentation and select the topic How to Use the Interfaces for Postal Validation and Duplicate Check & Error-Tolerant Search.
See also: