To add transaction to Google Analytics page from back-end (Express.js) I have installed universal-analytics.

Here is the example of function which is supposed to add products to transactions and revenue:

visitor
    .transaction(transaction.id)
    .item(products[0].product_price, 1, products[0].name)
    .send()

But there is a problem, when this piece of code executes, on GA page Product List Performance section, I can see it only in (not set) list.

So, how to fix it? I have not found anything about how to add products in lists. Has someone already implemented that?