11:22 Feb 1 

Il me semble qu'il s'agit d'une modification/correction/ajustement des donnees dans la base des donnees, et non dans la facture (soit on va y ajouter une note, soit on fera une facture supplementaire)

14:05 Jan 28 

Ah, now you've given us some important extra context there by saying it's Canada!

I don't know if the usage is different over there, but here in FR, 'ajustement' only means 'fitting' in the sense of 'to size' — like a fitting for a new dress; if it means 'putting a new battery in your car', that kind of fitting is 'montage' (pneus, batteries)

Now there really isn't anything you can 'adjust' on a battery (or a tyre) — you might be able to balance a wheel or service a battery (and the mention of 'collants' possibly hints at the latter)

Then again, it could still be a financial adjustment — I note they talk about a 'ajustement de batterie' (but not tyres?) anywhere in Canada; could this simply be a discount that is given, for example, if the battery should fail prematurely?

Either way, I agree with your idea of just using 'adjustment', which would work for both up to a point, and not attempting to resolve the ambiguity — though I do find it astonishing that at this level and in this sort of document, anyone would be stupid enough to use the same word side-by-side like this in 2 different meanings.

13:45 Jan 28 

because it's the adjustment or modification of a bill. However if they are talking about a client taking a bill or proof of sale to have a service performed on a battery, this would not be an adjustment. Maybe "maintenance" or "check" would work - in fact tire checks and battery checks are a routine part of service. It is a bit vague, but I do believe that it is discussing how to reference work performed in this software to ensure that it can follow the customer in any store within that same chain. It does however refer to specific work performed, in my opinion, that the company might take a loss on or might be a part of a protection package up until a certain limit of maintenance/checks/calibrations/etc are done. I assume tire and battery issues are covered in this package, as they mention having a free replacement period.

13:31 Jan 28 

I agree that there is ambiguity in this text about whether 'ajustement' refers to accounting or fitting.
Here is another example, which seems to refer to fitting this time:
"Si le principe de base est qu’éventuellement un client pourra faire un ajustement de batterie partout au Canada avec sa facture [Logiciel B] sans avoir ses collants, comment pourrons- nous offrir un service de qualité à notre clientèle si l’information inscrite sur la facture [Logiciel B] est incomplète ou différente d’un magasin à l’autre???
Perhaps the best solution is to simply translate it as "adjustment" which works for accounting, and also can be understood in the context of "fitting", even if it's not necessarily the best English term for that context.