Modify BADI HR_IN_ER_ADDRESS~GET_CIT_ADDRESS

Dear Friends,

I need to modify BADI HR_IN_ER_ADDRESS~GET_CIT_ADDRESS

Can anybody help me out the whole procedure to write code in it. I am not able to do the same.

Based on the T7INT5-TXGRP I NEED ADDRS.

Based on this T7INT5-addrs = ADRC-ADDrnumber , I NEED VALUES STREET, P O BOX NO, CITY AND PIN CODE FROM ADRC TABLE .

Thanks

Ravi