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Nahid Jawad Angon 
class PharmacySettings(models.TransientModel):
    _inherit = 'res.config.settings'

    product_group = fields.Many2one('product.group', string='Product Group')

    def set_values(self):
        res = super(PharmacySettings, self).set_values()
        self.env['ir.config_parameter'].set_param('custom_pharmacy_invoice_view.product_group', self.product_group)
        return res

    @api.model
    def get_values(self):
        res = super(PharmacySettings, self).get_values()
        ICPsudo = self.env['ir.config_parameter'].sudo()
        groups = ICPsudo.get_param('custom_pharmacy_invoice_view.product_group')
        res.update(
            product_group=groups

        )
        print(res)

When i wnat to save selection field value the this error occured:

psycopg2.errors.InvalidTextRepresentation: invalid input syntax for integer: "product.group(1,)"
LINE 1: ...FROM "product_group" WHERE "product_group".id IN ('product.g...

How can I solve it Please help me 

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Sudhir Arya (ERP Harbor Consulting Services)
Mejor respuesta

In setting the params, you should pass the ID of the group but you are passing the recordset which is causing the error.
Try this:

self.env['ir.config_parameter'].set_param('custom_pharmacy_invoice_view.product_group', self.product_group.id) # Pass ID like this: self.product_group.id
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