[FIX] fixed typo
[REF] moved and refactored _make_invoice so it can now stays in l10n_br_sale and works wether l10n_br_account_service is installed or not
[REF][FIX] in fact service_invoice_id and product_invoice_id fields cannot be cheched at this level because l10n_br_sale doesn't depend on l10n_br modules bring them. Open question: do we really need to check them? Their absence leads to fiscal documents with missing document, but that can still be corrected later, so is it really mandatory to block user at sale order level?
[FIX] typo
[FIX] typo
[REF] WARNING moved default 'Venda' fiscal category to l10n_br_account so it can be shared bewteen products and services. You need to change the ir_model_data id of this fiscal category by SQL to update your database