L00 and L01 in BW Query based Universe for Characteristics

Hi All,

While creating a universe based upon an SAP BW query, the BW characteristics seem to be doubled as dimensions, with one group markeded L00 and the other as L01.

Why are they doubled?

Is one "better" than the other?

For what purpose?

They key value in L00 returns "all" and L01 returms the key, but all attributes seem to be the same.

Thanks for your help,

John Hawk