This line is incorrect, the error only occurs for docker repositories. Yum repositories, for example, can have two content views with the same repositories. The two repositories will be merged together. Reported by: iballou https://access.redhat.com/documentation/en-us/red_hat_satellite/6.12/html/managing_content/managing_content_views_content-management#annotations:f2b2fb4b-9cf5-4cd3-9c7d-20acd266baa0