The values for asort1 and asort2 might change between order and receiving the book, but there is currently no way to change it, without reopening the basket which will mess with your order history. The other use case is changing the fund on receive - which might make the fund and the asort values not match as they are defined on the fund level. It would be nice if the statistic values could be edited during the receive process.
Still valid. Sometimes we need to change those fields after the reception is done. It is a nightmare to do. We should be able to easily change these values, with the proper permissions.
Actually, I believe this is fixed :) If you are on the invoice summary, there is a link "Edit fund". This modal also has the sort values for editing.