Hi Vaz,
Code need to be maintain in EXIT_SAPLRSAP_002, INCLUDE ZXRSAU02.
When you execute info pack at bw side, job will trigger and get into the exit function as per the type data source.
INCLUDE ZXRSAU01 is related transactional data sources.your data source 0BPARTNER_ATTR, master data attributes. so you need to put your code in ZXRSAU02 only.
Thanks