BSEG-EBELN and EBELP not populated at BTE 1120 structure

Hi!!

I person implemented a process relation module for BTE 1120 to marque immoderate substitutions astatine MIRO aft station document, but arsenic a information for substitution I request to cheque the PO we are processing in  MIRO...

I need: EKKO for PO type, and EKPO for Account Assignment Category (KNTTP)

t_BSEG operation has EBELN and EBELP attributes, but some are empty.

Do you cognize however to get EBELN and EBELP from BTE 1120 ?

Thanks!!