Create a View model from a source model and choose the "Transform.." option to generate default transformations.

The resulting View model will contain an extra <annotatedObject> reference in the same <annotations> element as the relational extension model reference

  
<mmcore:AnnotationContainer xmi:uuid="mmuuid:9c7ac03c-bafc-4aa1-855f-4e6a43dd9c21">
    <annotations xmi:uuid="mmuuid:7aeb8904-fe0c-42ac-ae67-72c8ce5b397d">
      <tags xmi:uuid="mmuuid:873b6c71-41d4-476a-bf9a-442cb7fd7943" key="modelExtensionDefinition:relational" value="relational"/>
      <annotatedObject href="XXXXXXX.xmi#mmuuid/7291fb4c-da39-4bbc-9787-d2edd9b9551c"/>
    </annotations>

This won't cause problems for the View model, however if the View model is copied to yet another view model, the Model Import for the original source model will end up in the top level view model due to the orphaned "href=....."