我想通过ABAP生成一段选择屏幕的代码

以下为一个简单的选择屏幕代码示例：

REPORT z_select_screen.

PARAMETERS: p_material TYPE mara-matnr.

SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE text-001.
PARAMETERS: p_date TYPE sy-datum DEFAULT sy-datum.
SELECTION-SCREEN END OF BLOCK b1.

SELECTION-SCREEN BEGIN OF BLOCK b2 WITH FRAME TITLE text-002.
PARAMETERS: p_quantity TYPE mara-meins DEFAULT 'PC'.
SELECTION-SCREEN END OF BLOCK b2.

SELECTION-SCREEN COMMENT /1(50) text-003.

START-OF-SELECTION.

WRITE: / 'Selected Material:', p_material.
WRITE: / 'Selected Date:', p_date.
WRITE: / 'Selected Quantity:', p_quantity.

其中，PARAMETERS语句用于定义屏幕上的参数，SELECTION-SCREEN BEGIN/END OF BLOCK语句用于将参数分组显示，SELECTION-SCREEN COMMENT语句用于在屏幕上显示注释文本。在START-OF-SELECTION块中，可以使用WRITE语句将选择的参数值输出到屏幕上。