Odoo how to trigger kit purchase order from manufacturing order - triggers

Question

I've a Manufactured Product with a BOM of 3 kits (K1, K2, K3).
Once i try to manufacture it, and its components aren't available, i want to trigger a purchase
order containing 3 lines:
Line 1 = K1
Line 2 = K2
Line 3 = K3
What happens is that Odoo create a purchase order containing 1 line for each component of the kits (K1, K2, K3).
I want to extend the manufacturing module to implement my need, how can i do ? which module should i extend ? any guide could be helpful !

Answer 1

If I am understanding correctly, then you want to create a Manufacturing Order for Manufactured Product which generates a Purchase Order for the products that make up the components (instead of a Purchase Order for the components themselves).
You would need to have an overall Product/BOM Structure like this:
Manufactured Product
├── Kit 1
│   ├── Purchased Product 11
│   └── Purchased Product 12
├── Kit 2
│   └── Purchased Product 13
└── Kit 3
   ├── Purchased Product 14
   ├── Purchased Product 15
└── Purchased Product 16
It sounds like your Kit # products are set up with Routes as Make To Order + Buy. This causes those products to be purchased.
Instead, your Kit # products should be set up with Routes as Make To Order + Manufacture with their own BOM of BoM Type Kit.
The Purchased Products should be assigned as BOM Lines on the relevant BOM and those purchased products should be set up with Routes as Make To Order + Buy.
Here is a simplified example of the 2-level BOM setup I'm talking about.
BOM for Manufactured Product
Manufactured Product
├── Kit 1
├── Kit 2
└── Kit 3
BOM for Kit 1
Kit 1
├── Purchased Product 11
└── Purchased Product 12