diff --git a/internal_transfer_with_agreed_amount/wizards/internal_transfer_multicurrency.py b/internal_transfer_with_agreed_amount/wizards/internal_transfer_multicurrency.py
index a435c1ac958..5f3fd08689a 100644
--- a/internal_transfer_with_agreed_amount/wizards/internal_transfer_multicurrency.py
+++ b/internal_transfer_with_agreed_amount/wizards/internal_transfer_multicurrency.py
@@ -21,14 +21,18 @@ def _get_currency(self):
         payment = self.env["account.payment"].browse(active_ids)
         return payment.destination_journal_id.currency_id or payment.company_currency_id
 
-    def _validate_currencies_in_internal_transfer(self, payment):
+    def _get_currencies(self, payment):
         payment_currency = payment.currency_id
         company_currency = payment.company_currency_id
         send_currency = payment.journal_id.currency_id or company_currency
         receive_currency = self.currency_id
         currencies = payment_currency | company_currency | send_currency | receive_currency
+        return currencies
+
+    def _validate_currencies_in_internal_transfer(self, payment):
+        currencies = self._get_currencies(payment)
         if len(currencies) == 2:
-            return currencies - payment_currency
+            return currencies - payment.currency_id
         raise ValidationError(
             _(
                 "Agreed amount is available when there are two considered currencies. "
@@ -37,13 +41,23 @@ def _validate_currencies_in_internal_transfer(self, payment):
             )
         )
 
-    def _prepare_values_from_lines(self, lines, currency):
+    def _prepare_values_from_lines(self, lines, currency=None, is_same_company_currency=False):
         line = lines[0]
+        if is_same_company_currency:
+            return {"debit": self.agreed_amount} if line.debit > 0 else {"credit": self.agreed_amount}
         vals = {"debit": line.debit} if line.amount_currency > 0 else {"credit": line.credit}
         sign = 1 if line.amount_currency > 0 else -1
         vals.update({"amount_currency": sign * self.agreed_amount, "currency_id": currency.id})
         return vals
 
+    def _preprocess_payments_hooks(self, payment):
+        """This method is to be inherited in case pre-processing is required on the payments."""
+        return payment
+
+    def _postprocess_payments_hooks(self, payment):
+        """This method is to be inherited in case post-processing is required on the payments."""
+        return payment
+
     def apply(self):
         active_ids = self._context.get("active_ids")
         active_model = self._context.get("active_model")
@@ -58,14 +72,19 @@ def apply(self):
         to_reconcile = amls.filtered(
             lambda l: l.account_id == l.company_id.transfer_account_id
         ).full_reconcile_id.reconciled_line_ids
+        context = {"check_move_validity": False, "skip_account_move_synchronization": True}
         if exchange_currency == payment.company_currency_id:
             if len(amls) != 4:
                 return
             amls.move_id.button_draft()
+            self._preprocess_payments_hooks(payment)
             debit = amls.filtered(lambda x: x.debit > 0)
             credit = amls.filtered(lambda x: x.credit > 0)
-            debit.with_context(check_move_validity=False).write({"debit": self.agreed_amount})
-            credit.with_context(check_move_validity=False).write({"credit": self.agreed_amount})
+            vals = self._prepare_values_from_lines(debit, is_same_company_currency=True)
+            debit.with_context(**context).write(vals)
+            vals = self._prepare_values_from_lines(credit, is_same_company_currency=True)
+            credit.with_context(**context).write(vals)
+            self._postprocess_payments_hooks(payment)
             amls.move_id.action_post()
             to_reconcile.reconcile()
             return
@@ -74,10 +93,11 @@ def apply(self):
         if len(aml_positive) > 2 or len(aml_negative) > 2:
             return
         aml_positive.move_id.button_draft()
-        context = {"check_move_validity": False, "skip_account_move_synchronization": True}
+        self._preprocess_payments_hooks(payment)
         vals = self._prepare_values_from_lines(aml_positive, exchange_currency)
         aml_positive.with_context(**context).write(vals)
         vals = self._prepare_values_from_lines(aml_negative, exchange_currency)
         aml_negative.with_context(**context).write(vals)
+        self._postprocess_payments_hooks(payment)
         aml_positive.move_id.action_post()
         to_reconcile.reconcile()