Configuring Siebel eBusiness Applications > Configuring EIM Interfaces > About EIM Object Types >

Interface Table User Key Usage Object Type

The Interface Table User Key Usage object type provides support for alternative user keys for base tables. An interface table user key usage object definition defines the use of a nontraditional user key for a given base table in a specific interface table.

NOTE:  Do not modifying user keys in standard Siebel tables or EIM base tables.