Compute margins

[ced (Cédric Krier)]

@pokoli

Because this is not usefull just for reporting but also to create rules contrains. For example:

• Require the authorization of the sale manager if the estimated profit it’s lower that a threhold.
• Add a warning when confirming sale where it is expected to have a negative profit.

You do not need to store the value for such usage. It should be managed with a similar design of sale_credit_limit.
And you will not base such constraint on the always changing cost price but instead put a lower limit on the sale price.

@pokoli

Because I thought we should support also profit calculation for services.

Not before having New invoicing method when selling both goods and services - #6 by ced

@pokoli

I think is relevant to have profit in SaleReporting because it give full details about how the customer/product impacts the profits of the company and the objective of the company is to increase the profits .

But this is not the targets of the sale group that’s why for me it has nothing to do with sales.