To view the mapping and its associated data object, you can use the predefined MRS views.
The MRX_MAP_SRCCNT view provides information about number of data objects for each mapping.
Example: SELECT DATA_OBJECT_NAME,DATA_OBJECT_TYPE,MAPPING_NAME FROM MRX_MAP_SRCCNT WHERE MAPPING_NAME= 'mp_T_CTL_complete_loading'
Above view gives a consolidated list of all the data objects used in the mapping.
You can make use of MRX_TX_SOURCES which will provide information about all mappings and mapping sources.
Please let me know if the above MRS views helped you to fulfill your requirement