JTL-Wawi 2.x: check your shop integration before upgrading
The vendor currently supports JTL-Wawi 2.1, 2.0 and 1.11 and gives no deadline (JTL-Guide). Anyone who upgrades has to go via 2.0.x. This guide shows how to check connector releases, shop and PHP version, SQL Server, Ameise templates and shipping in a test system before each stage.