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For loading or updating data in ENTITY tables, send the following your EagleML message to the eagle_ml-2-0_default_in_xml_entity stream.

Header Element

Please note, that you should use 

<header>
   <objectType>GenericEntity</objectType>
</header>

before your genericEntity section of the message. Otherwise you will be getting "No rule file selected" error

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Entity_Id_Element Entity_Id_Element

Entity Id Element

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The new entity xreference identifiers could be inserted into the RULESDBO.ENTITY_XREFERENCE DB table.
See the additional information about Legal Entity Xreference section

Also, see specific load cases for Generic Entity