diff --git a/account_payment_order/models/account_move_line.py b/account_payment_order/models/account_move_line.py
index 806745d9f..2d90c29d0 100644
--- a/account_payment_order/models/account_move_line.py
+++ b/account_payment_order/models/account_move_line.py
@@ -48,9 +48,10 @@ class AccountMoveLine(models.Model):
             else:
                 ml.partner_bank_id = ml.partner_bank_id
 
-    def _prepare_payment_line_vals(self, payment_order):
-        self.ensure_one()
-        assert payment_order, "Missing payment order"
+    def _get_communication(self):
+        """
+        Retrieve the communication string for the payment order
+        """
         aplo = self.env["account.payment.line"]
         # default values for communication_type and communication
         communication_type = "normal"
@@ -70,6 +71,12 @@ class AccountMoveLine(models.Model):
                 elif "out" in self.move_id.move_type:
                     # Force to only put invoice number here
                     communication = self.move_id.name
+        return communication_type, communication
+
+    def _prepare_payment_line_vals(self, payment_order):
+        self.ensure_one()
+        assert payment_order, "Missing payment order"
+        communication_type, communication = self._get_communication()
         if self.currency_id:
             currency_id = self.currency_id.id
             amount_currency = self.amount_residual_currency