The invoice should follow the dossier
When quote, invoice, and payment data are detached from the optical dossier, the team wastes time checking what was already paid, what is still due, and what can be handed to the client. Reliable billing is not one more module. It is workflow discipline.
The right model is simple: one clear order, readable billable lines, a coherent currency, correct tax logic, and a verifiable payment history. That level of clarity helps both the cashier and the branch manager.
Why it matters
A clean invoice reduces checkout errors, makes balance explanations easier for the client, and gives support and reporting a trustworthy history.