In the course of revising an authority record I added a form of personal
name that uses an at symbol (@):

 100 0- Barbara Jean, $d 1943-
 400 0- Barbara@Jean, $d 1943-

According to the NACO normalization table here:
such symbols are "retain[ed]" and therefore seem to be treated like any
other active character.  But when uploading the record to the NAF, I get an
error message that the "cross reference matches the [100 field] heading."
Is there a way around this short of either removing the 400 or using (if
this is kosher) a bracketed "at"?

Mark K. Ehlert                 Minitex
Coordinator                    University of Minnesota
Digitization, Cataloging &     15 Andersen Library
  Metadata Education (DCME)    222 21st Avenue South
Phone: 612-624-0805            Minneapolis, MN 55455-0439

  "Experience is by industry achieved // And perfected by
the swift course of time." -- Shakespeare, "Two Gentlemen
of Verona," Act I, scene iii