KEPH cost field

we have defined the cost component in OKTZ, to view the breakdown standard cost, I try to go to S_alr_ P99_41000111, but if I press F1 for any component cost, it says "no documentation available", if I go to KEPH table, there are around 35 cost field, in SE11, how to know which cost field in KEPH maps to S_alr_p99_410000111 cost component for example "direct labor"? thanks