From Version 2.0.0 of Clever Trade Plus "Approved Items" functionality has been added to the Product.
The "Approved Items" allows you to restrict the Items that are available for a Customer(s) through the Sales Order process, which can be important to ensure that you do not mistakenly ship goods to a Customer who is located in a Country that does not allow such goods to be imported.
"Sales Approved Item Groups" can be setup and then assigned to Customers that you wish to restrict Sales to the limited set of Items, as detailed here.