SAP ABAP Declare a type which is used in another type, variable, work area, internal table and constant.

REPORT z_abap101_039.
TYPES ty_reused_date TYPE d.
TYPES ty_creation_date TYPE ty_reused_date.
DATA v_creation_date TYPE ty_reused_date.
DATA v_update_date TYPE ty_reused_date.
DATA: BEGIN OF wa_document,
name TYPE string,
creation_date TYPE ty_reused_date,
update_date TYPE ty_reused_date,
END OF wa_document.
DATA: itab_documents LIKE TABLE OF wa_document.
CONSTANTS c_update_date TYPE ty_reused_date VALUE '99991231'.


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