VMS Help DCE_SECURITY, Admin Intro, DCE$IMPORT, Messages, IMP_PRINUSE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 principal <principal> in use by another OpenVMS username

         Explanation:

         The DCE principal name specified for the OpenVMS username being
         imported is associated with another OpenVMS username.

         User Action:

         Choose a DCE principal name that is not associated with any
         OpenVMS username.