Additional SQL Server features and topics not covered by specific categories
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Business rules are If/Then/Else statements that you create in Master Data Manager. If an attribute value meets a specified condition, then an action is taken, otherwise a Else action is taken. Possible actions include setting a default value or changing a value. If a user attempts to add an attribute value that doesn't pass business rule validation, the value can still be saved. You can review and correct validation issues, which are displayed in Master Data Manager.
You can create a business rule to enforce uniqueness of other attributes, but business rules will not prevent data loading.
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/3d44e28a-1291-456b-8269-5368b5f21d17/preventing-duplicate-inserts?forum=sqlmds