Wozu dienen die "Notizen" zu einer Kennung?

You can enter any note for each account under the menu item "Account | View/modify" in the step "Status/Note". The corresponding data field is exclusively available to you as the master user, i.e. it is not evaluated or modified by the LRZ. Of course, your users have no insight into these notes.

Accordingly, there are neither restrictions nor special recommendations as to what you should enter there.

To view the remarks on all accounts in your project, go to "Project | View/modify". There you will find the button "Notes on Accounts" under "[Project data]".