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You have to mention a code between two @ symbol as below: @0S@ Message text - This will add an information-icon before your message text. You can add whatever icon you like this way. For a list of icons, execute the transaction BIBS -> Go to Elements -> Icon overview. This will give you the list of icons. The last field denotes the icon code which you have to place between two @ symbol in your message (SM02)
T-code BIBS for Icon Overview
T-code SM02 for System Message