Please have a look at the image.
The price chart is this placed which says how much tax each item has.
Also have order details section where we can see order of a customer with three items.
And at last we can see tax invoice which is a repeating group and displays the tax rate and the items.
The question is how can I combine items in one, if they have exactly the same tax rate.
(In the examples shown above grapes and apple have 2% tax rate so they are displayed in a single row)