[FIX] account: use more efficient method

Check accounting entries in a more effective way.

closes odoo#124755

X-original-commit: 316c1d9
Signed-off-by: William André (wan) <wan@odoo.com>
Signed-off-by: Alvaro Fuentes Suarez (afu) <afu@odoo.com>

addons/account/models/company.py

@@ -401,7 +401,7 @@ def write(self, values):
 
             #forbid the change of currency_id if there are already some accounting entries existing
             if 'currency_id' in values and values['currency_id'] != company.currency_id.id:
-                if self.env['account.move.line'].search([('company_id', '=', company.id)]):
+                if company._existing_accounting():
                     raise UserError(_('You cannot change the currency of the company since some journal items already exist'))
 
         return super(ResCompany, self).write(values)