Hi

I want to show a button at the top of tasks that direct to a view of all tasks that have the same value in their field 'lead_id'.

this is my lead field: 

class project_Task(models.Model):
    _inherit = 'project.task'

    lead_id = fields.Many2one(comodel_name='crm.lead',
                              string='Opportunity',
                              tracking=True,
                              compute='_compute_lead_id',
                              readonly=False,
                              store=True
                              )

this is my xml:

I see the the button on the tasks (top right) but if i click it I get an error.

I think the issue most likely is in lines 8 and 9 of the xml, can you help me out?

Thanks in advance!

Friedrich