I need to skip the section and note while creating a serial number in orderline, i made many modification,still its considering the section and notes as a line item, And its creating a serial number for section and notes.

My Python code :

from odoo import api, fields, models


class SaleOrder(models.Model):
_inherit = 'sale.order'

@api.multi
@api.depends('order_line')
def _compute_maxim_line_sequence(self):

for sale in self:
for line in sale.order_line:
if line.name:
sale.maxim_line_sequence = (
maxim(sale.mapped('order_line.sequence') or [0]) + 1)

maxim_line_sequence = fields.Integer(
string='Maxim sequence in lines',
compute='_compute_maxim_line_sequence',
store=True
)

@api.multi
def _reset_sequence(self):
for rec in self:
current_sequence = 1
for line in rec.order_line:
if line.name:
line.sequence = current_sequence
current_sequence += 1

@api.multi
def write(self, line_values):
res = super(SaleOrder, self).write(line_values)
self._reset_sequence()
return res

@api.multi
def copy(self, default=None):
return super(SaleOrder,
self.with_context(keep_line_sequence=True)).copy(default)


class SaleOrderLine(models.Model):
_inherit = 'sale.order.line'

# re-defines the field to change the default
sequence = fields.Integer(
help="Gives the sequence of this line when displaying the sale order.",
default=9999,
# related='x_seq_handle',
string="Sequence"
)

# displays sequence on the order line
sequence2 = fields.Integer(
help="Shows the sequence of this line in the sale order.",
related='sequence',
string="Line Number",
readonly=True,
store=True
)

@api.model
def create(self, values):
line = super(SaleOrderLine, self).create(values)
# We do not reset the sequence if we are copying a complete sale order
if self.env.context.get('keep_line_sequence'):
line.order_id._reset_sequence()
return line

here i can't able to restrict to create serial number to only order line contains product it.

can you please help me to do this.