Using Chrome, logged into Chalmers 3.1 environment.
Steps to reproduce:
Go to the Checkin page of an ongoing order which has several expected pieces. Look at the order in which the expected pieces are displayed.
Pieces are displayed in chronological order based expected receipt date. This order facilitates finding the right piece to check in when a new issue has arrived in the mail.
I don't think the solution to this actually lies in changing how the pieces are ordered – rather this is a UX issue which we will have to live with until Check in is further developed to include, among other things, dedicated fields for enumeration, expected dates etc.