As an Enterprise Architect, you must ensure that future extensions to the Digital Core of...

Extensions do not break an upgrade, and upgrades do not break an extension. Such extensions can access SAP business objects only through well defined, upgrade-stable interfaces.

Extensions may access SAP tables directly and in a well-documented, clean way. Therefore, the code of extensions can be adapted quickly to accommodate future changes.

Extensions are kept strictly separate from the SAP application, Extensions are developed in accordance with the SAP Application Extension Methodology. Side-by-side extensibility options are always preferable to on-stack extensibility options.