PSP_PNR -> how to get this fields in BADI of NME52N

I have to find the value of the field "WBS element"-PSP_PNR in Tab Account Assignment of transaction ME52N.

User exit MBCF0005 should give me the data from EKKN, which includes

this field. However, the transaction ME52N doesn't stop in the User EXIT by break-point statment.

How can I get the value of this field?

BADI ME_PROCESS_REQ_CUST

both check methods and

Process account is also checked

no result

Kindly help me