Hello Vams,
I think CRMT_EXT_OBJ_NAME is defined in several tables. One of them is CRMC_OBJ_BTIL. In which context do you need it? You can check tables in the where-used-list of this data element, but this list will bring you more then 400 entries.
For CRMT_GENIL_OBJECT_ID I only find 4 tables in the where-used-list. But I think Genil Objects are also stored in CRMC_OBJ_BTIL.
Best regards,
Thomas Wagner