[FIX] base: keep company currency active

This commit aims at preventing the deactivation of a company currency.
Was the issue on 2852452 support ticket (v14). But it seems appropriate to merge it in 13.0 as it is probably a good idea that a company currency always stays active.

How to reproduce bug:
In 13.0:
Install accounting with demo data > activate multi currency in settings > deactivate usd > create new invoice > select eur currency > cannot set usd currency back on invoice

Reconcile JS traceback in 14.0:
Install accounting with demo data > activate multi currency in settings > deactivate usd > go to accounting dashboard > click on reconcile 7 items on Bank journal > click on any “customer/vendor matching” line.

closes odoo/odoo#104819

Task: 2852452
X-original-commit: 1e336810
Signed-off-by: Quentin De Paoli <qdp@odoo.com>

odoo/addons/base/i18n/base.pot

@@ -26687,3 +26687,9 @@ msgstr ""
 #: model:res.country,name:base.ax
 msgid "Åland Islands"
 msgstr ""
+
+#. module: base
+#: code:addons/base/models/res_currency.py:0
+#, python-format
+msgid "This currency is set on a company and therefore must be active."
+msgstr ""

odoo/addons/base/models/res_currency.py

@@ -8,6 +8,7 @@ import time
 import traceback
 
 from odoo import api, fields, models, tools, _
+from odoo.exceptions import UserError
 
 _logger = logging.getLogger(__name__)
 
@@ -45,6 +46,12 @@ class Currency(models.Model):
         ('rounding_gt_zero', 'CHECK (rounding>0)', 'The rounding factor must be greater than 0!')
     ]
 
+    @api.constrains('active')
+    def _check_company_currency_stays_active(self):
+        currencies = self.filtered(lambda c: not c.active)
+        if self.env['res.company'].search([('currency_id', 'in', currencies.ids)]):
+            raise UserError(_("This currency is set on a company and therefore must be active."))
+
     def _get_rates(self, company, date):
         if not self.ids:
             return {}