Regarding User exit for TCODE- CJ9CS for PS module

In the tcode - cj9cs it's picking the values from the structure RKPLV1 , finally i have to find where the values are stored , (i.e) in which table it's finally stored .

the program for tcode cj9cs is SAPMKPT4 where the process is going and the include name MKPT4F02 and please tell me where to put the BREAKPOINT

and see the values .