I have seen this link
Can we use KM internal repository for Customer use or is it mandatory to use any other specific repository
CM Repository Manager
Supports the entire spectrum of Knowledge Management functions.
The following CM repositories are contained in the standard delivery:
○ /documents (for managing content such as text documents)
○ /collaboration (for managing Collaboration content such as feedback)
○ /discussiongroups for managing discussion items
○ /userhome for personalization data and managing favorites
○ /grouphome for managing group-specific favorites
○ /rolehome for managing role-specific favorites
○ /reporting_backend for storing report-specific data
○ /taxdata for storing classification data persistently
○ /~system for storing low-level data such as thumbnails
For the SAP NetWeaver Information Broadcasting scenario, the CM /BIuserhome repository is used to manage user-specific BI data.