r21577 - gnucash/trunk/src/backend/xml - Fix xml backend to load and save invoice kvp values.

[Mike Alexander]

--On December 6, 2011 3:01:54 PM -0800 John Ralls <jralls at ceridwen.us> 
wrote:

>> This is not the optimal solution, but the best I can come up with in
>> my  available time and with the state of the backends as they are
>> now.
>
> No, I think that's got it.
>
> If you can't handle credit notes in 2.4 without too much of a change,
> you could detect them at load and raise ERR_BACKEND_TOO_NEW, though I
> admit that's not much of an improvement over failing to load because
> of an unrecognized element.

Could you bump the file version number only if credit notes exist in 
the file?  Or bump it the first time a credit note is used (leaving it 
bumped if all of them later get deleted)?  That might give you the best 
of both worlds: strict versioning, but old versions of Gnucash could 
open data files that don't use credit notes.

Actually you wouldn't literally bump it, but rather set it to n if it 
is less than n (where n is the first version that supports credit 
notes).  Would this work?

             Mike