code in BADI of ME21n

Hi frnds,

i need to write the code in method of BADI ie IF_EX_ME_PROCESS_PO_CUST~PROCESS_ITEM. this method i need to call 2 methods ie get_data and set_data.

can any one give the code for getting data thru get_data and how to post the data to set_data.

thanks in advance.

regards,

balu