I am using Odoo 10 CE

I have created three products A, B, and C.

Assign All / Saleable category to A, B, and C. Costing Method is 'Average' and Valuation is Perpetual (automated)

Create Bill of Material for A and assign B, C as component products

Create purchase order for B & C with prices 10 and 20 respectively.

Receive B & C into stock and their cost is updated to 10 and 20 as per intended functionality

Create Manufacturing Order of A and mark it as done.

Quantities of B & C are consumed.

However, Cost of product A is still 0, where as it should be 30. (Cost of B is 10 and Cost of C is 20)