The upgrade to 19.05 brings along a helpful change to the accountlines table that will require changes to reports.
In this blog post we grapple with the implications of fixing something that some libraries enjoyed having broken.
Koha Tutorial Videos
With the newest version of Koha 18.11, there are a few changes to the Accounts tab in the Patron’s Module. Most importantly, void is the word when dealing with the Patron's Account module.
Koha How-To
Details of an issue and its fix in how patron credits display