REFERENCE(SYSTEM) TYPE REF TO CL_DB6_SYS
REFERENCE(SYS_REF) TYPE REF TO CL_DB6_SYS
REFERENCE(SYSTEMID) TYPE REF TO CL_DB6_SYS
REFERENCE(SYS_REF) TYPE REF TO CL_DB6_SYS OPTIONAL
VALUE(SYS_REF) TYPE REF TO CL_DB6_SYS OPTIONAL