REPORT z_list_field_names.

TYPES:
  BEGIN OF t_types,
    name TYPE fieldname,
    desc TYPE as4text,
   END OF t_types.

DATA:
  v_types TYPE t_types,
  i_types TYPE SORTED TABLE OF t_types WITH NON-UNIQUE KEY name desc.

SELECT
  fieldname
  ddtext
INTO TABLE
  i_types
FROM
  dd03t
WHERE
  ddlanguage = 'EN'
  AND as4local = 'A'
  AND ddtext <> space.

DELETE ADJACENT DUPLICATES FROM i_types.

LOOP AT i_types INTO v_types.
  WRITE: / '|', v_types-name(30), '|', v_types-desc(60), '|'.
ENDLOOP.