When clicking the paste or paste in plain text the following error messages display.
Paste error: "Your browser doesn't allow you to paste this way. Press Ctrl+V to paste."
Paste in Plain Text error: "Your browser doesn't allow you to paste plain text this way. Press Ctrl+Shift+V to paste."
Internal RTC: https://swgjazz.ibm.com:8004/jazz/web/projects/OCS#action=com.ibm.team.workitem.viewWorkItem&id=223032
Dev states this is expected behavior, what seems to be due to a translation problem that exist in IBMCKEditor 4.7.2.
It can be a source of confusion and customer request to remove in future release