BE: Odoo.

FE: React Native.

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class PmaServiceOrder(models.Model):    
	​_name = "pma.service.order"    
	​_inherit = ["mail.thread", "mail.activity.mixin"]    
	​_description = "Manage Service Order"
   	​	​name = fields.Char(string="Service order ID" 	​	​compute="_compute_name", store=True)    
	​	​period_from = fields.Date(related="payment_period.period_from", readonly=True)    
	​	​period_to = fields.Date(related="payment_period.period_to", readonly=True)        
	​	​service_order_line = fields.One2many("pma.service.order.line",        "service_order", string="Service", tracking=True)
    	​total_service_fee = fields.Monetary(string="Total service fee",        compute="_compute_total_service_fee", store=True, tracking=True)    	​	​total = fields.Monetary(string="Total", compute="_compute_total", 	​store=True, tracking=True)



class PmaServiceOrderLine(models.Model):    
	​_name = "pma.service.order.line"    
	​_description = "Service order line"
    service = fields.Many2one("pma.apartment.service", string="Service", required=True, tracking=True)    
	​service_order = fields.Many2one("pma.service.order", ondelete="restrict", string="Service orders", tracking=True    )
	​type = fields.Selection(related="service.type", tracking=True)    
	​unit = fields.Char(related="service.unit", tracking=True)    
	​fees = fields.Monetary(related="service.fees", tracking=True)    
	​name = fields.Char(related="service.name", tracking=True)    
	​image_home = fields.Binary(related="service.image_home", tracking=True)    	​image_rent = fields.Binary(related="service.image_rent", tracking=True)    	​previous_read = fields.Integer(string="Previous read",        	​	​	​compute="_compute_previous_read",store=True, readonly=False, tracking=True)    current_read = fields.Integer(string="Current read", tracking=True)    	​quantity = fields.Integer(string="Quantity", required=True, tracking=True)    amount = fields.Monetary(string="Amount", required=True, tracking=True)

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When Create or Update Service Order, I don't know how to add line or update field (quantity, amount) in SO. 

Please help me