The reading access area matrix enables organization of user groups with object groups. Only a user with administrator profile connected to the maximum reading access area can configure reading access areas.
In the reading access area matrix, you can create two types of reading access areas:
• a
user reading access area 
, grouping only persons or person groups

To ensure coherence of the reading access diagram, if you begin management of reading access of your data from the reading access area matrix, you must continue to manage reading access from this matrix.
You can create links between these two types of reading access area.