diff --git a/models/pos_session.py b/models/pos_session.py
index 37e7b96..617aabd 100644
--- a/models/pos_session.py
+++ b/models/pos_session.py
@@ -40,17 +40,18 @@ class PosSession(models.Model):
                 # Net: $0
                 # We want to record: Credit Income $100, Debit Expense $100.
                 
-                # We can sum the positive lines to get the "Sale Value".
-                gross_amount = sum(
-                    line.price_subtotal 
+                # Calculate the exact discount amount applied by loyalty rewards
+                # This avoids treating downpayments or refunds as "100% Discount Income"
+                discount_amount = sum(
+                    abs(line.price_subtotal) 
                     for line in order.lines 
-                    if line.price_subtotal > 0
+                    if line.price_subtotal < 0 and (getattr(line, 'is_reward_line', False) or getattr(line, 'reward_id', False))
                 )
                 
-                if float_is_zero(gross_amount, precision_rounding=self.currency_id.rounding):
+                if float_is_zero(discount_amount, precision_rounding=self.currency_id.rounding):
                     continue
 
-                amounts = _get_amounts(gross_amount, order.date_order)
+                amounts = _get_amounts(discount_amount, order.date_order)
                 
                 # Create Credit Line (Income)
                 # We use _credit_amounts helper logic style manually