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okay so, I am trying to inherit the sale.order.line model and tapping into the create() method. The goal is that when a new order line gets added if it's a service-type product, we add a new order line with a specific product that is already set up on Settings. However, on the create() call, it throws an error saying: Record does not exist or has been deleted. (Record: sale.order.line(115,), User: 2) , I am not sure why. The first thing is, that the record exits and the second thing is, not using it on the create call. Here is my code: 

from odoo import models, fields, api
from odoo.exceptions import UserError


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

    @api.model
    def create(self, vals):
        sale_order_line = super().create(vals)
        order_id = sale_order_line.order_id.id
        product_type = sale_order_line.product_template_id.detailed_type
        shop_supplies_product = self.env["res.config.settings"].get_values()[
            "shop_supplies_product"
        ]
        shop_supplies_product = self.env["product.template"].browse(
            shop_supplies_product
        )
        shop_supplies_percentage = self.env["res.config.settings"].get_values()[
            "shop_supplies_percentage"
        ]

        if (
            product_type == "service"
            and sale_order_line.product_template_id.id != shop_supplies_product
            and shop_supplies_product
        ):
            current_shop_supplies = self.env["sale.order.line"].search(
                [
                    ("order_id", "=", sale_order_line.order_id.id),
                    ("product_template_id", "=", shop_supplies_product.id),
                ],
                limit=1,
            )
            shop_supplies_amount_nt = 0
            if current_shop_supplies:
                shop_supplies_amount_nt = current_shop_supplies.price_unit
                current_shop_supplies.unlink()

            current_shop_supplies_amount_nt = float(sale_order_line.price_subtotal)

            shop_supplies_amount_nt += (
                current_shop_supplies_amount_nt * float(shop_supplies_percentage)
            ) / 100
            order_line_fields = {
                "customer_lead": 0.0,
                "name": shop_supplies_product.name,
                "order_id": order_id,
                "price_unit": shop_supplies_amount_nt,
                "product_uom_qty": 1.0,
                "product_template_id": shop_supplies_product.id,
                "product_id": shop_supplies_product.product_variant_id.id,
            }
            self.env["sale.order.line"].sudo().create(order_line_fields)
        return sale_order_line


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Author Best Answer

The issue was matching an id with an instance of product.template. Fixed by changing the first if clause to:

if (
        product_type == "service"
        and sale_order_line.product_template_id.id != shop_supplies_product.id
        and shop_supplies_product
    ):


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