ALV中，欲保存布局，須在REUSE_ALV_GRID_DISPLAY函數中添加I_SAVE參數。I_SAVE定義為C數據類型，值如下：

??? ‘ ‘ = display variants cannot be saved
??? Defined display variants (e.g. delivered display variants) can be selected for presentation independently of this flag. Changes can not be saved.

??? ‘X’ = standard save
??? Display variants can be saved as standard display variants. User-specific saving is not possible.

??? ‘U’ = only user-specific saving
??? The user can only save display variants user-specifically

??? ‘A’ = standard and user-specific saving
??? The user can save a display variant user-specifically and as standard display variant. The user chooses in the display variant save popup.

為了進一步管理布局，則需要加入IS_VARIANT參數，其數據結構參考DISVARIANT，一般需要定義其中的REPORT=SY-REPID，VARIANT為布局保存格式。有三個有用函數供調用保存的格式布局，分別為：

REUSE_ALV_VARIANT_DEFAULT_GET 讀取默認的布局
REUSE_ALV_VARIANT_EXISTENCE 檢測指定布局是否存在
REUSE_ALV_VARIANT_F4 顯示布局格式選擇對話窗

總結

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