This article describes compatibility issues related to the introduction of Module Objects in GeneXus X Evolution 3.
The first time a Knowledge Base created with previous GeneXus versions is opened with Evolution 3 (or newer versions) it is converted to support Module Objects. Once converted, it cannot be opened by previous GeneXus versions.
Changes to the Knowledge Base:
The generated code is not affected by this conversion. It does change when new Module objects are created and objects are moved to or created in those modules. See Working with Modules for further details.
Java package name property must be set if at least one Module object is created in the KB.
GeneXus X Evolution 3 Release Notes