adding products to an order

-- HikaShop version -- : 4.2.2
-- Joomla version -- : 3.9.16
-- PHP version -- : 7.2
-- Browser(s) name and version -- : all
-- Error-message(debug-mod must be tuned on) -- : none

If in backenad I want to modify an order, we can not sellect variants of products to add, only the default one.

Paul