New data field for invoice object

[Geert Janssens]

On zaterdag 8 oktober 2011, Geert Janssens wrote:
> I'm working on introducing full credit note support in GnuCash [1]. After
> thinking it through for a long time I came to the conclusion I will need to
> add an extra parameter to the invoice object that has to be saved and
> restored from the data file.
> 
> I could use a new kvp, so older versions of GnuCash won't have any problems
> with this. The thing is though that credit notes require changes as such a
> fundamental level in de business logic that older GnuCash versions will
> probably choke on them anyway, or create wrong results. So backward
> compatibility is not really feasible.
> 
> And since kvp's are not nice for the sql backend, I think it will be better
> to use a true field.
> 
> I never added a field, and we have two major backend technologies now. So
> I'm asking some input on how to best proceed.
> 
> Derek suggested on irc to make it an optional field so that if credit notes
> are not used, older versions of GnuCash can still work with the data file.
> I can imagine this with the xml backend, but is such a thing possible with
> the sql backend as well ?
> 
> Geert

...and the [1] was supposed to refer to
http://wiki.gnucash.org/wiki/Credit_Notes