I try to get only invoices with payment_management = False when I click on Without payment management tree view

Nevertheless I get as a result invoices where payment_management = False, what is more curiouse when I change to True, the result is still the same. Any clue? Thank you.

.py:

payment_management = fields.Boolean()      

.xml:

<record id="payment_management_filter_ib_tree" model="ir.ui.view">

        <field name="name">payment.management.filter.ib</field>

        <field name="model">account.invoice</field>

        <field name="type">search</field>

        <field name="inherit_id" ref="account.view_account_invoice_filter"/>

        <field name="arch" type="xml">

                <xpath expr="/search/filter[1]" position="before">

          <filter name="payment_management" string="Without payment management" domain="[('payment_management','=','False')]"/>

                </xpath>

        </field>

</record>