How to create Structure by ABAP Code in SAP

Structures
Are record declarations that do NOT correspond to a Database Table.
Just like user-defined data type.
Defined like a table and can then be addressed from ABAP programs.
Structures contain data only during the run time of a program.

Complete Program
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TYPES: BEGIN OF TY_MARA,
MATKL TYPE MARA-MATKL,
MATNR TYPE MARA-MATNR,
ERSDA TYPE MARA-ERSDA,
ERNAM TYPE MARA-ERNAM,
MTART TYPE MARA-MTART,
END OF TY_MARA.

DATA: ITAB1 TYPE TABLE OF TY_MARA,
WA1 TYPE TY_MARA.
PARAMETERS: P_MATKL TYPE MARA-MATKL DEFAULT '01'.

SELECT MATKL MATNR ERSDA ERNAM MTART FROM MARA INTO TABLE ITAB1 WHERE MATKL = P_MATKL.



WRITE: / SY-ULINE(100) .
WRITE:/ 'MATERIAL GRUP', 20 'MATERIAL NO.', 40 'CREATED ON', 60 'CREATED BY' ,80 'MATERIAL TYPES', 100'|'.
WRITE: / SY-ULINE(100) .

LOOP AT ITAB1 INTO WA1.

WRITE: / WA1-MATKL, 20 WA1-MATNR, 40 WA1-ERSDA,60 WA1-ERNAM,80 WA1-MTART,100 '|'.
ENDLOOP.
WRITE: / SY-ULINE(100) .

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