This place is most things about SAP.
It's DAVID's knowledge base to summarize his knowledge of SAP during work.
If you also wanna build it to share your knowledge togerther with me here, please just mail blueoxygen at gmail.com.

• ABAP official link
• ABAP CHECKBOX 和LISTBOX使用
• Add user-defined button on applicatin bar(在选择屏幕的标准应用工具条上增加自定义按钮)
• Hide standard execute button at selection screen
• Build search help(F4)
• Build search help(F4) for PC and server file selection
• ABAP Interview FAQ's
• Send email
  
• Exception handling
• check,exit,stop,return...
• Convert currency manually(Don't use FM)
• Call executable programm
• Determining the Attributes of Data Objects
• 负号前显