I quote this article based on http://erpmoldeo.wordpress.com/2012/01/14/calculating-a-product-cost-with-openerp/
Last week I had the opportunity to try a very useful module that, IMHO, should be included in OpenERP core. This module is product_extended and can be found in the extras repository, you can download it with the following command:
# bzr branch lp:openobject-addons/extra-6.0
This module does many things, among them shows the product last order for a supplier and its date. But what is really interesting is that it calculates a product cost based on its Bill of Materiales. In order to do that, first you need to check the “Compute Standard Price” check box in the product form,
Then, you can either click on the “Compute Standard Price” button or check it in the product bill of materials (a product can have more than one bill of materials). In the latter, you can find the product information on the Bill of Materials form.
You can calculate the standard price by clicking on the “Compute Standard Price” wizard on the right of the BoM form. How is this cost calculated? This is the interesting part, it takes into account the product cost of each product, plus the hours and cycle costs of every workcenter that is involved in its routing. A very useful module.
It needs a minor change in order to make it work with OpenERP 6.1 but you should try it, I highly recommend it
Cheers!
