[IMP] l10n_pe: Welcome ISC tax
The SUNAT requires than when a ISC tax is used on an invoice, on the
cbc:TierRange attribute be specified the ISC type.
Now, the 3 options could be:
- 01: System to value
- 02: Application of the Fixed Amount
- 03: Retail Price System
To this, now was added a new field on the tax, with this options.
Extra, the ISC could have many amount options, for now, only is
generated a tax for 0%, that allows to the customer only change the
percentage that will to use.
Legal Reference:
Catalog No 08: https://cpe.sunat.gob.pe/node/88
Guide for the Preparation of Electronic Invoice:
https://cpe.sunat.gob.pe/sites/default/files/inline-files/gu%C3%ADa%20xml%20para%20factura%20electr%C3%B3nica%20%28ubl%202.0%29_0.pdf
Impuesto selectivo al consumo (ISC):
https://www.gob.pe/7918-impuesto-selectivo-al-consumo-isc
closes odoo/odoo#98962
Signed-off-by: Josse Colpaert <jco@odoo.com>