How table BPEJ is populated?

Hi,

due to all of your help, guys, I have now progressed in my investigation of negatives in my IM programme

thank you all to the help in my previous post.

Now I know that the negatives values that I see in IM32 come from tables  BPBK & BPEJ

I also know that the values com via structutre FCALV_S_BPEP0001_LIST that is used in a program BPEP0001

But I'm not an ABAPer, so I can't understand from there how that value of Minus 70 is actually calculated...

Please could someone help me to understand how the values are populated in BPEJ, Budget type  KBUD....