Once the login page is kept inactive for a while or page is re-logged in, the sequence numbers starts from begining and I am unable to figure out where exaclty the thing is going wrong.

Like in sale.order the name field is not repeated again. If SO0001 is existing, it will not be repeated again, but in my case SR0001 is getting created again.

Field :

name = fields.Char(string='Name', required=True, copy=True, readonly=True, states={'draft': [('readonly', False)]}, index=True, default=lambda self: _('New'))

Py file : 

@api.model

    def create(self, vals):

        if vals.get('name', _('New')) == _('New'):

            vals['name'] = self.env['ir.sequence'].next_by_code('sample.kit') or _('New')

        if 'user_id' in vals:

            if not self.env['hr.employee'].browse(vals['user_id']).user_id:

                raise UserError(_('In order to create a Sample Kit Request for this employee, you must link him/her to a user.'))

        res = super(SampleKitManagement, self).create(vals)

        res.write({'state': 'draft'})

        return res

XML File :

<record id="ir_seq_sample_request_number" model="ir.sequence">

<field name="name">Sample Request</field>

<field name="code">sample.kit</field>

<field name="prefix">SR</field>

<field name="padding">4</field>

<field name="number_increment">1</field>

<field name="number_next_actual">1</field>

<field name="implementation">standard</field>

</record>

Regards.

Sumit Sinha