SCM-Manager/docs/en/user/group/external.md

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Groups	External groups (CAS)

Users who log on to SCM-Manager via a CAS (Central Authentication Service) instance receive additional groups from the CAS. External groups can be used without manual creation in SCM-Manager. However, adding the groups marked as "external" has the advantages that the groups created are taken into account in the auto-completion and authorizations can be assigned directly to an external group. Which external groups are assigned to a user can be read out on the profile page of a registered user.

See example: CasGroup