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The message simply means that although you've defined the variable, and perhaps given it a value from somewhere, you never read from it anymore. Typically this means that you don't actually need the variable. Sometimes you do need it, but only perhaps as a field to select into when doing an existence check. In these cases it is valid to hide the check using the "EC comment.
This is because the variable to get the name of SAP R/3 is declared and assigned the value sy-sysid, but no where the variable is assigned to other variable..
Since it is used for only assignment, in the extended program check it shows as no read access.
To avoid this you can avoid declaring the variable if it is not used anywhere in your code, else comment the code as given in extended check.
Bluesky
