[fix] get ur value from context

views/hr_expense.xml

@@ -38,7 +38,7 @@
                     <attribute name="invisible">True</attribute>
                 </xpath>
                 <field name="product_id" position="attributes">
-                    <attribute name="domain">[('ur_id', '=', ur_id)]</attribute>
+                    <attribute name="domain">[('ur_id', '=', context.get('ur_id'))]</attribute>
                 </field>
                 <field name="reference" position="attributes">
                     <attribute name="invisible">True</attribute>