I am not getting the unloading point field update from PO in ME21N

I am not getting the unloading point feild update fromin  PO   ME21N

When i  create PO(ME21N) with  with Acct.Assigment Cat = 'Y' AND item Category = 'B' ( Blanket PO) , not getting updated UNLOADING POINT(Line Item Account assignment TAB).

If some can help me , really helpful and thanks in advance.

The following code wrote on PO BADI but it is not working.

po BADI:ME_PROCESS_PO_CUST

Method:PROCESS_ACCOUNT

Code:
DATA:ls_mepoaccounting TYPE  mepoaccounting.
ls_mepoaccounting = im_account->get_data( ).
ls_mepoaccounting-ablad = 'TEST'.
im_account->set_data( ls_mepoaccounting ).

Thanks & Regards

Kushal