Hi,

Go to Inventory then Configuration under that go to Operation Types, Select Internal Transfers

Under the General Page

You can see Create Backorder set it to Never

Then the Backorder will not be created

Hope it helps

Disabling automatic backorder creation in the Inventory Settings does not affect manufacturing orders created through the Work Centers - Odoo 16. The backorder creation behavior in Manufacturing Orders is handled separately from general inventory backorders, and there is no direct setting in Inventory Settings to control this behavior specifically for Work Centers in the manufacturing flow. How to prevent backorders when confirming a manufacturing order through the Work Center?

Depending on the Odoo version you're using, version 16.0 and later provide option to operation types to control whether to create backorder or not as mentioned on the earlier answer.

However, if that option is not available in the version you're using, you can remove the Create Backorder button from the popup so users won't be able to create backorder. To do so,

1. Enable Developer mode, You must have settings access 

2. Go to Settings >> Technical >> User Interface >> Views

3. Create a new view as below

This will remove the Create Backorder button. This a functional solution which can be implemented from  Odoo backend. Any other requirement/usecase  might need customization. Hope this helps.

Regards,

Karan BK