diff --git a/models/__pycache__/account_payment.cpython-310.pyc b/models/__pycache__/account_payment.cpython-310.pyc
index 2836bab..44437af 100644
Binary files a/models/__pycache__/account_payment.cpython-310.pyc and b/models/__pycache__/account_payment.cpython-310.pyc differ
diff --git a/models/__pycache__/account_payment.cpython-312.pyc b/models/__pycache__/account_payment.cpython-312.pyc
index 1ba693a..3560ac7 100644
Binary files a/models/__pycache__/account_payment.cpython-312.pyc and b/models/__pycache__/account_payment.cpython-312.pyc differ
diff --git a/models/account_payment.py b/models/account_payment.py
index bef1a2b..aed736c 100644
--- a/models/account_payment.py
+++ b/models/account_payment.py
@@ -125,20 +125,27 @@ class AccountPayment(models.Model):
                 all_lines = move.line_ids
                 liquidity_lines, counterpart_lines, writeoff_lines = pay._seek_for_lines()
 
-                if len(liquidity_lines) != 1:
-                    raise UserError(_(
-                        "Journal Entry %s is not valid. In order to proceed, the journal items must "
-                        "include one and only one outstanding payments/receipts account.",
-                        move.display_name,
-                    ))
+                # Skip validation if payment has amount_substract (from vendor_payment_diff_amount module)
+                # This module creates additional lines that don't fit the standard pattern
+                has_substract = hasattr(pay, 'amount_substract') and pay.amount_substract and pay.amount_substract > 0
+                
+                if not has_substract:
+                    if len(liquidity_lines) != 1:
+                        raise UserError(_(
+                            "Journal Entry %s is not valid. In order to proceed, the journal items must "
+                            "include one and only one outstanding payments/receipts account.",
+                            move.display_name,
+                        ))
 
-                if len(counterpart_lines) != 1:
-                    raise UserError(_(
-                        "Journal Entry %s is not valid. In order to proceed, the journal items must "
-                        "include one and only one receivable/payable account (with an exception of "
-                        "internal transfers).",
-                        move.display_name,
-                    ))
+                    # Allow for additional lines (like substract account from vendor_payment_diff_amount)
+                    # Check if we have at least one counterpart line, not exactly one
+                    if len(counterpart_lines) < 1:
+                        raise UserError(_(
+                            "Journal Entry %s is not valid. In order to proceed, the journal items must "
+                            "include at least one receivable/payable account (with an exception of "
+                            "internal transfers).",
+                            move.display_name,
+                        ))
 
                 if any(line.currency_id != all_lines[0].currency_id for line in all_lines):
                     raise UserError(_(