jordi fita mas e11a3c57f5 Add validation of single tax from each class
We only allow a single tax of each class in products and invoices,
because it does not make sense to add two different VAT to the same
product, for instance.
2023-03-01 11:55:26 +01:00
..
2023-02-28 12:02:27 +01:00
2023-01-17 10:40:22 +01:00
2023-01-22 20:37:34 +01:00