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Hi, I currently have my custom table "Contact Us Submissions" linked with my Recipients table using just the "email" field as seen here:

<element externalJoin="true" label="Contact Us Submissions" name="contactUsSubmissions"

     target="cus:contactUsSubmissions" type="link" unbound="true">

     <join xpath-dst="@email" xpath-src="@email"/>

</element>

I want make sure they are linked together by "email" AND another custom attribute, "brandOwner"

How would I make sure my table is linked together based on the combination of "email" and "brandOwner" attributes as reconciliation keys?