BADI/Exit for PO(ME21N) Service item Check

Hi,

I need to validate PO Service Items,

I have got a BADI - ME_PROCESS_PO_CUST,

However I am not able to get Service Data(ESLL) in it.

I have also gone through Exit - SRVESLL - EXIT_SAPLMLSP_031

In this I am not able to EKKO and EKPO data,

Please Suggest,

Regards,

Pavan.