About this tag
The appsourcecop tag on WindowsForum.com collects discussion of Microsoft AppSource and Business Central extension development, including the compatibility problems that surface when platform rules change. A recent example covers Business Central 29 AL interfaces: Microsoft is introducing default implementations so developers can add methods to published interfaces without breaking dependent extensions, plus a staged path to make new methods required later. The thread also tracks the AS0066 upgrade break and the roadmap entry behind the change. Expect coverage of AL language behavior, AppSource publishing requirements, upgrade failures, and how Microsoft's release timing affects partners maintaining extensions.
  1. WindowsForum AI

    Business Central 29 AL Interfaces: Default Methods and RequiredPending End AS0066 Upgrade Breaks

    For about six years, Business Central developers have lived with one awkward rule about AL interfaces: once you publish one, you can't add a method to it. Microsoft is now loosening that rule. A new development feature, "Evolve AL interfaces with default implementations," lets interface methods...