Prefer CASE to ELSE IF check is not correct

[macemmi]

You can do a CASE only if in all ELSE branches the same variable is used. We get findings for code like this:

IF ls_posting-betrw > 0.
  ls_posting-shkzg = 'S'.
ELSEIF ls_posting-betrh > 0.
  ls_posting-shkzg = 'S'.
ELSEIF ls_posting-betr2 > 0.
  ls_posting-shkzg = 'S'.
ELSEIF ls_posting-betr3 > 0.
  ls_posting-shkzg = 'S'.
ELSE.
  ls_posting-shkzg = 'H'.
ENDIF.

how can this be replaced by a CASE?