diff --git a/openupgrade_scripts/scripts/sale_loyalty/16.0.1.0/post-migration.py b/openupgrade_scripts/scripts/sale_loyalty/16.0.1.0/post-migration.py
index 2d66c16ff69..14abd4bcb23 100644
--- a/openupgrade_scripts/scripts/sale_loyalty/16.0.1.0/post-migration.py
+++ b/openupgrade_scripts/scripts/sale_loyalty/16.0.1.0/post-migration.py
@@ -80,15 +80,19 @@ def _generate_sale_order_coupon_points(env):
             coupon_id, order_id, points, create_uid, write_uid, create_date, write_date
         )
         SELECT
-            id AS coupon_id,
-            order_id,
-            points,
-            create_uid,
-            write_uid,
-            create_date,
-            write_date
-        FROM loyalty_card
-        WHERE order_id IS NOT NULL;
+            lc.id AS coupon_id,
+            lc.order_id,
+            lc.points,
+            lc.create_uid,
+            lc.write_uid,
+            lc.create_date,
+            lc.write_date
+        FROM loyalty_card lc
+        LEFT JOIN sale_order_coupon_points socp
+        ON lc.order_id = socp.order_id
+        AND lc.id = socp.coupon_id
+        WHERE lc.order_id IS NOT NULL
+        AND socp.id IS NULL
         """,
     )
 
diff --git a/openupgrade_scripts/scripts/sale_loyalty/16.0.1.0/pre-migration.py b/openupgrade_scripts/scripts/sale_loyalty/16.0.1.0/pre-migration.py
index 7f4d126d71d..e742e224a4c 100644
--- a/openupgrade_scripts/scripts/sale_loyalty/16.0.1.0/pre-migration.py
+++ b/openupgrade_scripts/scripts/sale_loyalty/16.0.1.0/pre-migration.py
@@ -138,13 +138,6 @@ def update_sale_order_line_data(env):
     )
 
 
-def delete_sql_constraints(env):
-    # Delete constraints to recreate it
-    openupgrade.delete_sql_constraint_safely(
-        env, "sale_loyalty", "sale_order_coupon_points", "order_coupon_unique"
-    )
-
-
 def update_template_keys(env):
     """Update template keys of the merged sale_gift_card module in loyalty_sale"""
     openupgrade.logged_query(
@@ -178,5 +171,4 @@ def migrate(env, version):
     openupgrade.rename_xmlids(env.cr, _xmlids_renames)
     update_loyalty_program_data(env)
     update_sale_order_line_data(env)
-    delete_sql_constraints(env)
     update_template_keys(env)
diff --git a/openupgrade_scripts/scripts/sale_loyalty/16.0.1.0/upgrade_analysis_work.txt b/openupgrade_scripts/scripts/sale_loyalty/16.0.1.0/upgrade_analysis_work.txt
index 028049ff17c..25525ef4fb3 100644
--- a/openupgrade_scripts/scripts/sale_loyalty/16.0.1.0/upgrade_analysis_work.txt
+++ b/openupgrade_scripts/scripts/sale_loyalty/16.0.1.0/upgrade_analysis_work.txt
@@ -91,7 +91,7 @@ DEL ir.model.access: sale_gift_card.access_gift_card_sales
 # NOTHING TO DO
 
 NEW ir.model.constraint: sale_loyalty.constraint_sale_order_coupon_points_order_coupon_unique
-# DONE pre-migration: safely delete constraint to recreate it
+# NOTHING TO DO
 
 DEL ir.rule: sale_coupon.sale_coupon_apply_code_rule (noupdate)
 # DONE: post-migration: safely deleted xmlid