diff --git a/addons/stock/views/stock_scrap_views.xml b/addons/stock/views/stock_scrap_views.xml
index 8d47cf24f58..fa730f3dc95 100644
--- a/addons/stock/views/stock_scrap_views.xml
+++ b/addons/stock/views/stock_scrap_views.xml
@@ -52,7 +52,7 @@
                                 <div class="o_row">
                                     <field name="scrap_qty" attrs="{'readonly': ['|',('state', '=', 'done'),('tracking', '=', 'serial')]}"/>
                                     <field name="product_uom_category_id" invisible="1"/>
-                                    <field name="product_uom_id" attrs="{'readonly': [('tracking', '=', 'serial')]}" groups="uom.group_uom" force_save="1"/>
+                                    <field name="product_uom_id" attrs="{'readonly': ['|',('state', '=', 'done'),('tracking', '=', 'serial')]}" groups="uom.group_uom" force_save="1"/>
                                 </div>
                                 <field name="lot_id" context="{'default_product_id': product_id, 'default_company_id': company_id}" attrs="{'invisible': ['|',('product_id', '=', False),('tracking', '=', 'none')], 'required': [('tracking', '!=', 'none')]}" groups="stock.group_production_lot"/>
                             </group>