lib/server-core/src/main/java/org/apache/olingo/server/core/serializer/json/ODataJsonSerializer.java [531:540]:
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  private void addKeyPropertiesToSelected(Set<String> selected, EdmStructuredType type) {
    if (!selected.isEmpty() && type instanceof EdmEntityType) {
      List<String> keyNames = ((EdmEntityType) type).getKeyPredicateNames();
      for (String key : keyNames) {
        if (!selected.contains(key)) {
          selected.add(key);
        }
      }
    }
  }
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lib/server-core/src/main/java/org/apache/olingo/server/core/serializer/xml/ODataXmlSerializer.java [645:654]:
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  private void addKeyPropertiesToSelected(Set<String> selected, EdmStructuredType type) {
    if (!selected.isEmpty() && type instanceof EdmEntityType) {
      List<String> keyNames = ((EdmEntityType) type).getKeyPredicateNames();
      for (String key : keyNames) {
        if (!selected.contains(key)) {
          selected.add(key);
        }
      }
    }
  }
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