diff --git a/purchase_advance_payment/models/purchase_order.py b/purchase_advance_payment/models/purchase_order.py
index ebfe5214672..bf6ab79e741 100644
--- a/purchase_advance_payment/models/purchase_order.py
+++ b/purchase_advance_payment/models/purchase_order.py
@@ -81,8 +81,15 @@ def _compute_purchase_advance_payment(self):
                     advance_amount += line_amount
             # Consider payments in related invoices.
             invoice_paid_amount = 0.0
-            for inv in order.invoice_ids:
-                invoice_paid_amount += inv.amount_total - inv.amount_residual
+            for inv in order.invoice_ids.filtered(lambda m: m.state == "posted"):
+                po_lines = inv.invoice_line_ids.filtered(
+                    lambda line, order=order: line.purchase_line_id.order_id == order
+                )
+                po_total = sum(po_lines.mapped("price_total"))
+                if not inv.currency_id.is_zero(inv.amount_total):
+                    inv_paid = inv.amount_total - inv.amount_residual
+                    proportion = po_total / inv.amount_total
+                    invoice_paid_amount += inv_paid * proportion
             amount_residual = order.amount_total - advance_amount - invoice_paid_amount
             payment_state = "not_paid"
             if mls or not order.currency_id.is_zero(invoice_paid_amount):