Why KOAR settlement is included in RPSCO table, but KOAO & KOAL are not?

Please could somewhone help me to understand:

- Why KOAR settlement is included in RPSCO table, but KOAO & KOAL are not?

Also, is there somewhere some description/documentation available on what is in principle included into RPSCO Table & wahts is not?

Many thanks in advance,

Daria