I know that there is currently a solution for uploading the invoice a second time. But if you want to split a Peppol invoice across multiple cost categories, you currently have to go through an amount of warnings. It would be more convenient if the tool allowed you to do this directly without having to upload the invoice a second time.
I have also read somewhere that you are working here, but could this be moved to the top of the list? It would make life even easier for many people.