sap的選擇螢幕的標準工具欄上系統預先定義了5個按鈕，他們對應的功能碼是fc01-fc05，預設是不啟用的。使用者可以使用selection-screen function key i.來啟用這5個按鈕（這裡的i必須是1-5）,這五個按鈕的文字放在sscrfields的對應的functxt_0i中。當使用者按下按鈕時，系統將觸發at selection-screen 事件,並將功能碼放到sscrfields的ucomm欄位中。
report z_zcd_014.
tables sscrfields. "定義工作區
parameters: p_carrid type s_carr_id,
p_cityfr type s_from_cit.
selection-screen: function key 1, "啟用按鈕
function key 2.
initialization.
sscrfields-functxt_01 = '@49@ 哈哈'.
sscrfields-functxt_02 = '@54@ 呵呵'.
at selection-screen.
case sscrfields-ucomm. "處理按鈕命令
when'fc01'.
p_carrid = 'lh'.
p_cityfr = 'frankfurt'.
when 'fc02'.
p_carrid = 'ua'.
p_cityfr = 'chicago'.
endcase.
start-of-selection.
write / 'start-of-selection'.
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