If no mark up has been set for the client, the system gets on default the one specified inside the supplier. To set up a markup for a client, it is necessary to associate first the client to a group. If the group has not been created yet, go to menu Admin > Clients > Groups > New Group and fill the fields with the set up of the markup.
Once the group has been created, it is needed to go in the Configuration tab of the customer's profile and associate the group to the client (label “Group”).
In the page Admin > Clients > Groups, if a group is selected, it is possible to see the markup setting and the list of the clients associated.