Hi,
The warning message you provided indicates that the

<act_window>

<record>

<act_window id="wizard_action_stock_check"
         name="Check Stock"
         src_model="stock.inventory"
res_model="bi.stock.check.report"
         view_type="form" view_mode="form"
         key2="client_action_multi" target="new"
     groups="base.group_no_one"/>

<record>

<act_window>

<record id="action_stock_inventory_check" model="ir.actions.act_window">
            <field name="name">Stock Check</field>
<field name="res_model">bi.stock.check.report</field>
            <field name="view_mode">form</field>
<field name="view_id" ref="bi_stock_inventory_check_form"/>
            <field name="target">new</field>
</record>

Hope it helps

Hi,

If you have tried to create a window action using the tag:  act_window, you have to replace this with record as follows:

<record id="product_template_action" model="ir.actions.act_window">
record>

Thanks