VALUE(EX_HEADER) TYPE REF TO CL_PO_HEADER_HANDLE_MM
VALUE(IM_HEADER) TYPE REF TO CL_PO_HEADER_HANDLE_MM OPTIONAL
REFERENCE(IM_PO_HEADER) TYPE REF TO CL_PO_HEADER_HANDLE_MM
REFERENCE(IM_PO) TYPE REF TO CL_PO_HEADER_HANDLE_MM
REFERENCE(IM_HEADER) TYPE REF TO CL_PO_HEADER_HANDLE_MM