Modules:Sell Below Cost
This module creates a new approval based on the unitary cost. If it is configured and you sell a product below the cost it will rise an approval.
In order to bring Unitary Cost information to WebPOS you first need to configure Unit Costs. Here you can find how to do it. It is needed to install Product Cost Module also.
Create the preference 'Web POS Sales price under cost price' to use this functionality.
When completing a ticket, if the final price to be applied is below cost, the supervisor will have to approve it.