CLASS-POOL [MESSAGE-ID id].
The CLASS-POOL statement must be the first statement of a standalone program, after any Include programs have been called. It introduces a class pool. Class pools are maintained in the Class Builder in the ABAP Workbench. A main programfor a global class, including a CLASS-POOL statement, is generated automatically. The MESSAGE-ID addition to the CLASS-POOL statement has the same meaning as for the REPORT statement.