Raritan Computer DKSXII-V2.3.0-0D-E - Manual (Page 307)

Appendix B: Updating the LDAP/LDAPS Schema
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2. Scroll to the user class in the right pane and right-click it.
3. Choose Properties from the menu. The user Properties dialog
appears.
4. Click the Attributes tab to open it.
5. Click Add.