Our company is a print manufacturing firm using odoo15 as our ERP framework.

In our manufacturing environment, we want to initiate a manufacturing order regardless of whether or not there is inventory available on product.product from a sale order.

Product (enable: MTO & Manufacture Routes) >> Sale Order (add product to Sale Order Line) >> Confirm Sale Order >> Generates Manufacturing MRP Order

I thought that what I've done below would work to ensure that a manufacturing order would be generated regardless of whether or not product.product's qty was > 0.

If anyone is familiar with odoo 15, and maybe a method I haven't checked for, please feel free to drop a note. Thanks!

from odoo import models
from odoo import api, models, SUPERUSER_ID, _
from collections import defaultdict


class StockRule(models.Model):
    _inherit = 'stock.rule'
    
    def _should_auto_confirm_procurement_mo(self, p):
        return False

    @api.model
    def _run_manufacture(self, procurements):
        productions_values_by_company = defaultdict(list)
        errors = []
        for procurement, rule in procurements:
            # Removing below to ensure that MOs are generated regardless of circumstance

            # procurement.product_qty = max(1, procurement.product_qty)
            # if float_compare(procurement.product_qty, 0, precision_rounding=procurement.product_uom.rounding) <= 0:
            #     # If procurement contains negative quantity, don't create a MO that would be for a negative value.
            #     continue

            bom = rule._get_matching_bom(procurement.product_id, procurement.company_id, procurement.values)
            if not bom:
                continue

            productions_values_by_company[procurement.company_id.id].append(rule._prepare_mo_vals(*procurement, bom))

        if errors:
            raise ProcurementException(errors)

        for company_id, productions_values in productions_values_by_company.items():
            # create the MO as SUPERUSER because the current user may not have the rights to do it (mto product launched by a sale for example)
            productions = self.env['mrp.production'].with_user(SUPERUSER_ID).sudo().with_company(company_id).create(productions_values)
            self.env['stock.move'].sudo().create(productions._get_moves_raw_values())
            self.env['stock.move'].sudo().create(productions._get_moves_finished_values())
            productions._create_workorder()
            productions.filtered(self._should_auto_confirm_procurement_mo).action_confirm()

            for production in productions:
                origin_production = production.move_dest_ids and production.move_dest_ids[0].raw_material_production_id or False
                orderpoint = production.orderpoint_id
                if orderpoint and orderpoint.create_uid.id == SUPERUSER_ID and orderpoint.trigger == 'manual':
                    production.message_post(
                        body=_('This production order has been created from Replenishment Report.'),
                        message_type='comment',
                        subtype_xmlid='mail.mt_note')
                elif orderpoint:
                    production.message_post_with_view(
                        'mail.message_origin_link',
                        values={'self': production, 'origin': orderpoint},
                        subtype_id=self.env.ref('mail.mt_note').id)
                elif origin_production:
                    production.message_post_with_view(
                        'mail.message_origin_link',
                        values={'self': production, 'origin': origin_production},
                        subtype_id=self.env.ref('mail.mt_note').id)
        return True