Change attributes only instead of replacing node

beesdoo_pos/views/beesdoo_pos.xml

@@ -21,8 +21,8 @@
             <field name="model">account.bank.statement.cashbox</field>
              <field name="inherit_id" ref="account.view_account_bnk_stmt_cashbox" />
             <field name="arch" type="xml">
-               <field name="coin_value" position="replace">
-                   <field name="coin_value" readonly="1"/>
+               <field name="coin_value" position="attributes">
+                   <attribute name="readonly">1</attribute>
                </field>
             </field>
         </record>