I have used the AtomSphere process which has input connector, map, profiles and output connector. Then tested the MDM using sample contacts details. The golden records were created in MDM repository. Here if I pass duplicate/redundant values that is also created as golden record. To avoid this situation we tried match rule, data quality and tags but it checks only input data and allowing/creating duplicate values as new golden records.
Can someone provide a solution to write custom rule in MDM to check with existing golden records before creation.