[IMP] *: restrict the deletion of used currencies

addons/lunch/models/lunch_cashmove.py

@@ -11,7 +11,7 @@ class LunchCashMove(models.Model):
     _description = 'Lunch Cashmove'
     _order = 'date desc'
 
-    currency_id = fields.Many2one('res.currency', default=lambda self: self.env.company.currency_id)
+    currency_id = fields.Many2one('res.currency', default=lambda self: self.env.company.currency_id, required=True)
     user_id = fields.Many2one('res.users', 'User',
                               default=lambda self: self.env.uid)
     date = fields.Date('Date', required=True, default=fields.Date.context_today)

addons/sale/models/sale.py

@@ -190,7 +190,7 @@ class SaleOrder(models.Model):
         required=True, readonly=True, states={'draft': [('readonly', False)], 'sent': [('readonly', False)]},
         domain="['|', ('company_id', '=', False), ('company_id', '=', company_id)]", tracking=1,
         help="If you change the pricelist, only newly added lines will be affected.")
-    currency_id = fields.Many2one(related='pricelist_id.currency_id', depends=["pricelist_id"], store=True)
+    currency_id = fields.Many2one(related='pricelist_id.currency_id', depends=["pricelist_id"], store=True, ondelete="restrict")
     analytic_account_id = fields.Many2one(
         'account.analytic.account', 'Analytic Account',
         readonly=True, copy=False, check_company=True,  # Unrequired company