[REF] l10n_it_fatturapa_in_rc: Allow to override RC line detection

l10n_it_fatturapa_in_rc/wizard/wizard_import_fatturapa.py

@@ -4,10 +4,14 @@
 class WizardImportFatturapa(models.TransientModel):
     _inherit = "wizard.import.fatturapa"
 
+    def _is_in_reverse_charge_line(self, line):
+        """The e-invoice line `line` should be imported as reverse charge."""
+        return float(line.AliquotaIVA) == 0.0 and line.Natura.startswith("N6")
+
     def _prepare_generic_line_data(self, line):
         retLine = {}
         account_tax_model = self.env["account.tax"]
-        if float(line.AliquotaIVA) == 0.0 and line.Natura.startswith("N6"):
+        if self._is_in_reverse_charge_line(line):
             # search reversed tax
             account_rc_type_tax = self.env["account.rc.type.tax"].search(
                 [("rc_type_id.e_invoice_suppliers", "=", True)]