Hi,

By default, when a Manufacturing Order (MO) is generated from a Sales Order (SO), Odoo doesn’t assign a Responsible user automatically. The field user_id on mrp.production (MO) usually defaults to the Manufacturing team lead or stays empty, not the sales rep.

Try any of the following methods.

1-Server Action (Automated Action)

• Model: Manufacturing Order (mrp.production)
• Trigger: On Creation
• Action: Write user_id from the related Sales Order (origin) → which points to the SO. Example code in a Python action:

  if record.origin:
      sale = env['sale.order'].search([('name', '=', record.origin)], limit=1)
      if sale and sale.user_id:
          record.user_id = sale.user_id.id
  

This ensures the Sales Rep (sale.order.user_id) becomes the MO’s responsible.

2- Studio / No-Code (if you have Odoo Studio)

• Add a related field on MO: sales_order_user = fields.Many2one('res.users', related='sale_id.user_id')
• Then set a default for Responsible = that related field.

3- Custom Module (Cleanest for Production)

If you want it consistent across all environments, override the create method in mrp.production:

from odoo import models, api

class MrpProduction(models.Model):
    _inherit = "mrp.production"

    @api.model
    def create(self, vals):
        res = super().create(vals)
        if res.origin:
            sale = self.env['sale.order'].search([('name', '=', res.origin)], limit=1)
            if sale and sale.user_id:
                res.user_id = sale.user_id.id
        return res

* If you want a quick solution, go with the Automated Action — no code deployment needed.

*If this is for a multinational / production setup, implement it as a small custom module so it’s clean, version-controlled, and works regardless of Studio/Automation.

Hope it helps