Siebel Business Analytics Applications Installation and Administration Guide > Customizing the Siebel Data Warehouse > Siebel Data Warehouse ETL Process Concepts >
About the Siebel Data Warehouse DATASRC_NUM_ID Column
All the tables in the Siebel Data Warehouse schema have DATASRC_NUM_ID as part of their unique user key. This means that the rows can be loaded in the same data warehouse tables from different sources if this column is given a different value for each data source.
NOTE: The DATASRC_NUM_ID value of 1 is reserved for the main Siebel data source and cannot be used for other sources.