Selector for non-persistable referenes

Hi, I'm calling in some customer data from a REST interface. If I the Customer is a persistable entity all customers returned by the REST interface will be committed into the database. If I change the entity into a NPE then I'm not able to allow the user to select a value as the selector widget does not support this.  I like to use the REST interface as a data source for a dropdown and then commit only what the user selected (and map it in case that customer already exists). Is there a way to achieve this? Br, Tom
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