Usually in ABAP, when you want to start the debugger from a certain point, you just have to write "/H" in the
command window. But if you are in a modal screen or in a message display, you cannot write the traditional
"/H", here is how to do it :
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Open notepad and paste these lines in a document : [FUNCTION] Command=/H Title=Debugger Type=SystemCommand
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Save this document anywhere on your local pc. ex: c:\breakpoint.txt
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Drag&drop this file from the explorer to your ABAP modal screen....