Attempting to use a referent value which is not fully resolved.
          #6095   Run-time catchable error
          Attempting to use a referent value which is not fully resolved.
Additional Information
 For referent 'X'.
     where X is the name of the referent.
Explanation
This error occurs when an attempt is made to get the value of a referent using
REFERENTS Key in an action that expects a string value. For example,
the output file in the following code is subject to this error:
     OPEN s WITH REFERENTS-ALLOWED AS REFERENT "A"
     PUT s REFERENT "B"
     CLOSE s
     OUTPUT FILE REFERENTS KEY "A"
     SET REFERENT "B" TO "my.file"