Hi,

When validating a Sale Order, the system creates a delivery Order to specify that the quantity Y of product X is to be delivered to client : from Stock Location to Customer Location.

Imagine you don't have any stock of product X.

So the forecasted in this case = - Y ( Because forecasted = Qty on hand + receipts - deliveries ). for more details, Check out:
https://www.odoo.com/fr_FR/forum/aide-1/odoo-10-qty-on-hand-and-forecast-quantity-diffeence-124057#:~:text=Forecasted quantity %3D Onhand quantity %2D outgoing,quantity %2B incoming shipment product quantity.

see following img: https://ibb.co/RjgsMFk

Now after Click on Replenish, you get a MO and therefore the quantity forecasted = 0 because the system considers the quantity Y is planned to be manufactured ( consider it as a reception, but not from a supplier, from you! ).

When MO is done, you get Qty onhand = Y which is going to be reserved for your delivery Order : https://ibb.co/Jq9PHJw

hope this helps.

Thanks Ibrahim.
this is understood but I was expecting to get a MO when I confirm a SO.
perhaps it is best to rephrase my questions;
How do I create an MO automatically when I confirm a Sales Order?

FYI. when i try to manufacture a similar product I get a MO.
When I try and duplicate the BoM and create a new product for it an MO is generated. all looks fine.

FYI2: I am testing over and over again and sometimes I am unlock, cancel and deleting a confirmed SO. I am suspecting that this product is now corrupt due to deletion of the confirmed SO. What happens if I unlock and delete a sales order? would this be a reason for this behaviour?

Hi,
to answer your question: How do I create an MO automatically when I confirm a Sales Order?
you need to have :
1- Product with MTO and Manufacture routes.
2-BOM of that material that depends on products you manufacture also. I believe if you have products that you purchase, then the system won't create a MO until you receive these products from a supplier.

That's it.
hope it helps.