Hope you have worked on enhancements and on which userexit you worked can you explain?

Extended the Data source 0MATERIAL_ATTR , 0PLANT_ATTR, 0MAT_PLANT_ATTR for Master Data load from R/3 to BW. Edited User exit EXIT_SAPLRSAP_002 to populate Master Data for extended fields and EXIT_SAPLRSAP_001 for transaction data to extract from R/3 to BW