Domain was a non-MCS CHARACTER data type

  Explanation:  This message is used as a subcode to
  SQL$_DOMNOTBCK.  It indicates that the offending domain was a
  new subtype of CHARACTER or VARYING CHARACTER.

  User Action:  If the columns defined using this domain contain
  only MCS data, change the domain to reflect that fact.
  Otherwise, the database cannot be exported WITH NO EXTENSIONS
  until this domain is removed completely.