You can find an explanation of this term in The SAP DB Database System ® Terms ® SQL mode.
This document describes the database system functions provided by the INTERNAL SQL mode.
Only those SQL statements are described for which the same SQL mode is used to both generate the object and execute the statement for the object. If database objects are created in one SQL mode and addressed in another, the object may have properties that are not known in the current SQL mode and, therefore, cannot be described.