Audit data changes
Track changes made to your business data by enabling auditing. Analyze the history of a particular record, view a summary of everything that changed, or track when a user accesses Microsoft Dynamics 365. Keep track of the changes done to a record, a field, or by a user. Microsoft Dynamics 365 automatically creates logs for the changes that are tracked.
More information about how to view what changed in a record: TechNet: Audit data and user activity