Code meaning

Hello experts can anyone tell me the menaning of the follwing code?

• Read Serial Number from Name Plate Data.

clear: klah, kssk.

select single atwrt

• into (rt_outtab-sernp)

into (rt_outtab-sernr)

from ( klah as a inner join kssk as k

on a_{clint = k}clint )

join ausp as p

on k_{objek = p}objek

and k_{clint = p}atinn

where a~klart = '002'

and a~class = 'KSE_SN_ENDOSCOPES'

and k~objek = rt_outtab-equnr.

Thanks

SP