Hi. I want to copy all the information stored in the one2many relation when I double the entry to the view. All values except for the on2many relation are copied. I have even tried to overwrite the copy function to do it by hand but there is something I must be doing wrong or that I have not come to understand.

Here its the code of the class

class EmpleadosProductos(models.Model):
	_name = "employee.as.product"
	collection_lines = {}
	employee_line = fields.One2many(
		'employee.line', 
		'order_id', 
		string='Employee Lines'
		)
	state = fields.Selection([('creado', 'Creado'),
		('confirmado', 'Confirmado'),
		('cancelado', 'Cancelado'),
		('validado', 'Validado'),
		('pagado', 'Pagado')
		], string='Status', index=True, readonly=True, track_visibility='onchange', copy=False, default='creado', required=True, help='Estado del parte de empleado')
	companyias = fields.Many2one('res.partner', 'Obra', domain=[('is_company', '=', True)])
	amount_total = fields.Monetary(string='Total', store=True, readonly=True, compute='_calcularTotal')
	journal_entry = fields.Many2one('account.move')
	currency_id = fields.Many2one('res.currency', 'Currency', required=True, default=lambda self: self.env.user.company_id.currency_id.id)
	fecha = fields.Date('Fecha')
	referencia = fields.Char(string='Ref', required=True) 
	# referencia = fields.Char(string='Ref', required=True) 
	journal_id = fields.Many2one('account.journal', 'Journal')
	_sql_constraints = [
    	('refererecia_constraint', 'unique(referencia)', 'La referencia debe de ser única!'),
	]
	@api.multi
	def action_confirmar(self):
		self.write({'state': 'confirmado'})
	@api.multi
	def action_cancelar(self):
		self.write({'state': 'cancelado'})
	@api.multi
	def action_validar(self):
		self.write({'state': 'validado'})
	@api.multi
	def action_pagar(self):
		self.write({'state': 'pagado'})
	@api.multi
	def copy(self, default):
		default.update({
			'employee_line' : self.employee_line,
			'referencia': '',
		})
		return super(EmpleadosProductos, self).copy(default)