ME28 PO Release strategy

Hi,

In PO Release strategy, under user exit EXIT-SAPLEBND_002 (CEKKO is the release structure PO Rel. Strategy.)

My req. is i have to get EKKO-KOSTL (cost center values) based on EKKO-EBELN or EXPO-EBELP, unless PO saved i can't use present PO number in select query.

Suggest your solution to get cost centers on present PO number with select query?

My SAP version is 3.1i

Thanks in advance.

Leela😭