ASSIGN и SY-SUBRC

DATA lv_matnr TYPE matnr.

FIELD-SYMBOLS <s_matnr> TYPE matnr.

sy-subrc = 4.

ASSIGN lv_matnr TO <s_matnr>.
IF sy-subrc IS INITIAL.
  WRITE 'Success!'.
ELSE.
  WRITE 'Failed'.
ENDIF.