Authorís Alterations have
been charged in the printing trade for many years.
alterations are changes made to a job after it has already been sent to
a printer for production. The change could be in copy, specifications or
both. If you (the customer) make changes to your original file, these
are AAs and the printer can charge you for making them. If, however, the
errors are attributable to the printer, these are PEs (printer's errors)
and you don't pay for correcting them.