Here is code 

    
        

    
        
            mail.activity.schedule.form.inherit
            mail.activity
            
            
                
                    
                    
                
            
        
    
    
    

from odoo import models, fields

class MailActivity(models.Model):
    _inherit = 'mail.activity'

    activity_time = fields.Float(string='Activity Time')  # Float to represent hours
    activity_schedule_date = fields.Datetime(string='Schedule Date')  # Datetime for scheduling
    company_id = fields.Many2one('res.company', string='Company', default=lambda self: self.env.company)

Here is erorr
 File "/home/rbi/workspace/odoo17/odoo/tools/convert.py", line 567, in _tag_root
    raise ParseError(msg) from None  # Restart with "--log-handler odoo.tools.convert:DEBUG" for complete traceback
odoo.tools.convert.ParseError: while parsing /home/rbi/workspace/odoo17/custom_addons/Adgency/view/crm_lead_from.xml:52
Error while validating view near:

                    
                    
                    
                    
                    

Field "has_error" does not exist in model "mail.activity"

View error context:
{'file': '/home/rbi/workspace/odoo17/custom_addons/Adgency/view/crm_lead_from.xml',
 'line': 5,
 'name': 'mail.activity.schedule.inherit',
 'view': ir.ui.view(1217,),
 'view.model': 'mail.activity',
 'view.parent': ir.ui.view(289,),
 'xmlid': 'view_mail_activity_schedule_inherit'}