[IDM] Mapping userPrincipalName to krbPrincipalName

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In a full IDM environment (no active directory), we need to add an "userPrincipalName" attribute to user accounts, since some of our external applications are looking for this specific attribute.

In IdM configuration, we can modify the default objectclass for user, and add upn attribute for each user account.

The next step is:
Is it possible to force userPrincipalName value to be the same as krbPrincipalName value automatically ?