There is no auditing mechanism as such, which tracks the modification history of a node.We keep a record of the user only when checking-in as a new version, where the userwho created the version is recorded.A version can have multiple objects.The desired auditing information by the customer can be recorded in the database ifusers every time check-in objects as New version.This will leave records in the database for every new version.We have the Version Manager command, which lists all Versions in a project with theuser who published it.To find more details about the Version Manager command, refer Tecnomatix help