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# Configuring Foreign Key Pairs

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In a one-to-one EIS mapping, you relate a source object attribute to a target object attribute by specifying one or more pairs of source and target object fields.

In a one-to-one EIS mapping with key on source (see "EIS One-to-One Mappings With Key on Source") using XML records, TopLink puts the target XML field value into the source object's record as a simple value.

In a one-to-one EIS mapping with key on target (see "EIS One-to-One Mappings With Key on Target") using XML records, TopLink uses the source XML field value in the selection interaction to acquire the appropriate instance of target object.