diff --git a/sale_ux/models/sale_order.py b/sale_ux/models/sale_order.py
index 1da3769dd..d601cd69f 100644
--- a/sale_ux/models/sale_order.py
+++ b/sale_ux/models/sale_order.py
@@ -112,7 +112,10 @@ def update_prices(self):
                     else:
                         line.expand_pack_line(write=True)
 
-            line.product_uom_change()
+            if pack_installed and line.product_id.pack_ok:
+                continue
+            else:
+                line.product_uom_change()
             line._onchange_discount()
         return True