It is important to know what the margin is. This is why we developed a module that shows the margin in the Sales Orders form.

First thing is to display margin on the top of the Sales Order Form - this will save you some seconds while browsing a sales orders. More important is that module displays margins for every single Sales Order Lines - thanks to this feature you won't sell product with a lose anymore.

Get the module here:

Odoo Margin in Sales Order Lines