Please share your XML and python code to get more details and root cause.

Hi Avatar Sudhir Arya. This is my code

def assign_lead(self):

self.ensure_one()

_logger.info("test assign lead")

lead_selected = self._context.get('active_ids', [])

_logger.info(lead_selected)

return True

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

<field name="name">crm.lead.asign_form</field>

<field name="model">crm.lead</field>

<field name="priority" eval="20"/>

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

<form string="assign_lead_form" create="false" edit="false">

<sheet>

<group>

<group>

<field name="user_id"/>

<field name="team_id" widget="selection" />

</group>

</group>

</sheet>

<footer>

<button name="assign_lead" type="object" class="btn-primary" string="Assign lead"/>

<button name="cancel" string="Cancel" special="cancel" class="oe_link"/>

</footer>

</form>

</field>

</record>