循环itab字段类型表访问字段

Question

我有以下内容：

Types: begin of ty_main,
         bukrs like bseg-bukrs,
         fstyl type lvc_t_styl,
       end of ty_main.
DATA: it_main TYPE TABLE OF ty_main,
      wa_main LIKE LINE OF it_main.
Loop it_main into wa_main where fstyl-style = 
                                   cl_gui_alv_grid=>mc_style_disabled.
endloop.

有人可以告诉我如何访问fstyl风格吗？ 感谢