diff --git a/versions/17.0/pre_upgrade.sh b/versions/17.0/pre_upgrade.sh
index f5c8116..644145b 100755
--- a/versions/17.0/pre_upgrade.sh
+++ b/versions/17.0/pre_upgrade.sh
@@ -51,6 +51,58 @@ EOF
 echo "SQL command = $PRE_MIGRATE_SQL_3"
 query_postgres_container "$PRE_MIGRATE_SQL_3" ou17 || exit 1
 
+# ────────────────────────────────────────────────────────────
+# Remove project_list's ir.actions.act_window.view records
+#
+# `project_list` (OCA) is not ported to 17.0 and is classified as
+# merged_in_core: in 17.0 the core `project` module natively adds the
+# kanban/tree views to the "Projects" actions (act_window_id 149 & 760).
+# 17.0 also introduces the unique constraint
+# `act_window_view_unique_mode_per_action = unique(act_window_id, view_mode)`.
+#
+# When core reloads project_project_views.xml, it INSERTs its own
+# (act_window_id, view_mode='kanban') rows, which collide with the rows still
+# owned by project_list -> UniqueViolation, aborting the registry load:
+#
+#   ERROR: duplicate key value violates unique constraint
+#   "act_window_view_unique_mode_per_action"
+#   DETAIL: Key (act_window_id, view_mode)=(760, kanban) already exists.
+#
+# We delete project_list's act_window_view rows (and their ir_model_data) so
+# core can recreate its canonical rows. Verified against the 17.0 OpenUpgrade
+# scripts: none reference project_list xmlids nor remap these records, so this
+# is safe. Scoped to ir.actions.act_window.view only. Idempotent.
+# ────────────────────────────────────────────────────────────
+PRE_MIGRATE_SQL_4=$(cat <<'EOF'
+DO $$
+DECLARE
+    deleted_count INTEGER;
+BEGIN
+    WITH targets AS (
+        SELECT d.id AS imd_id, d.res_id AS awv_id
+        FROM ir_model_data d
+        WHERE d.module = 'project_list'
+          AND d.model = 'ir.actions.act_window.view'
+    ),
+    del_views AS (
+        DELETE FROM ir_act_window_view
+        WHERE id IN (SELECT awv_id FROM targets)
+        RETURNING id
+    ),
+    del_imd AS (
+        DELETE FROM ir_model_data
+        WHERE id IN (SELECT imd_id FROM targets)
+        RETURNING id
+    )
+    SELECT count(*) INTO deleted_count FROM del_views;
+
+    RAISE NOTICE 'Removed % project_list act_window_view record(s) to avoid act_window_view_unique_mode_per_action collision', deleted_count;
+END $$;
+EOF
+)
+echo "SQL command = $PRE_MIGRATE_SQL_4"
+query_postgres_container "$PRE_MIGRATE_SQL_4" ou17 || exit 1
+
 # Copy filestores
 copy_filestore ou16 ou16 ou17 ou17 || exit 1