A Note About Validations and Data Integrity 

Compared to a transactional system, where data integrity tends to be absolute and all data must be entered perfectly before the record is saved, MDM is a data management system with records that evolve and are enriched over their lifecycle. Moreover, since data in MDM isn’t linked to a single process, business application, or downstream system, there may be different validations and business rules that are applicable in different circumstances. As a result, MDM data entry and validations tend to be fairly flexible and forgiving rather than overbearing, to avoid encouraging a user to put junk values into fields that cannot be empty.