LB_BIL_INVOICE form issues
I made my own custom form and I'm trying to figure out how to extract the right data. Looking at LB_BIL_INVOICE, I notice that it is using this code to print the address of the customer:
get customer adress number
READ TABLE IS_BIL_INVOICE-HD_ADR INTO GS_HD_ADR
WITH KEY BIL_NUMBER = IS_BIL_INVOICE-HD_GEN-BIL_NUMBER
PARTN_ROLE = IS_NAST-PARVW.
ADRNR = GS_HD_ADR-ADDR_NO.
Does anyone know where "IS_BIL_INVOICE" is set? I know it's defined as a parameter in the form interface but I can't figure out where it's being set with its corresponding number. Is it in t-code vf02?