Generating Customer Bills

[Liz]

On Fri, 29 Mar 2013 11:51:22 -0700 (PDT)
HerbEber <herb.eber at psychologicalresources.com> wrote:

> Your answer implies that our books are "done in pencil" i.e.
> alterable to correct errors. "Correct" errors, not correct the
> effects.  Some accountants I know would have kittens.  What used to
> be called "pen and ink" created a permanent record, warts and all,
> and then recorded needed (and performed) corrections.

Alas, one cannot achieve the same in any form of computerised
recordkeeping. Leaving the original transaction and placing a reversing
transaction was of course correct. 
The only way you can show that a computerised record is unchanged from
the date of creation involves a notarising service which effectively
countersigns a digital mark of the file at a particular time and date.

I believe that you wanted in your most recent question, to create a
credit note, as your answer to the mistake made in the data entry. At
the moment, credit notes are not available in Gnucash. 

As your original question was phrased as 'how do I handle a data entry
error?", in the computerised world you correct your error.
If you had asked "does Gnucash do a credit note?" you would have got a
different answer.