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记性真的不好了，连自己写的代码都看不懂了。 例如下面让用户选择文件夹的代码： CALL METHOD cl_gui_frontend_services=>directory_browse CHANGING selected_folder = folder. CALL METHOD cl_gui_cfw=>flush. why should we call the flush method? here is some notes about this mehtod, from http://blog.csdn.net/xyfchris/archive/2007/06/29/1671481.aspx “In OO approach, calling a Control-method does not imply that the method is automatically executed at runtime. Initially, the system buffers methods in a queue, referred to [...]

from : http://help.sap.com/saphelp_smehp1/helpdata/en/c4/3a7f05505211d189550000e829fbbd/content.htm “In general, job steps run sequentially and synchronously in the order they’re entered in a job: the first step starts, runs, and is completed, then the second step starts, and so on. The only exception is when you schedule an external program to run asynchronously. In this case, the background processing system [...]