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| Siebel Object Types Reference > Siebel Object Types Reference > EIM Interface Table Object Types > Interface Table User Key UsageAn interface table user key usage provides support for alternative user keys for tables. It determines how Siebel CRM uses a nontraditional user key for an interface table. Siebel Enterprise Integration Manager (EIM) uses this object type. For more information, see Siebel Enterprise Integration Manager Administration Guide. CAUTION: You must not modify this object type. Any modifications can adversely affect performance. This object type occurs in the following location in the object hierarchy: 
 Table 112 describes properties that Siebel CRM uses with an interface table user key usage. 
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