pos_usability : add pos initial amount

pos_usability/views/pos_session.xml

@@ -15,6 +15,20 @@
         <button name="show_journal_items" position="after">
             <button name="%(point_of_sale.action_report_pos_order_all)d" type="action" class="oe_stat_button" icon="fa-table" string="Stats" context="{'search_default_session_id': active_id}"/>
         </button>
+        <xpath
+            expr="//field[@name='cash_register_total_entry_encoding']/parent::group"
+            position="before"
+        >
+        <group>
+            <field
+                    style="text-align:right;margin:0;padding:0;"
+                    name="cash_register_balance_start"
+                    widget="monetary"
+                    options="{'currency_field': 'currency_id'}"
+                    string="Starting Balance"
+                />
+        </group>
+        </xpath>
     </field>
 </record>