odata2-annotation-processor/annotation-processor-core/src/main/java/org/apache/olingo/odata2/annotation/processor/core/ListsProcessor.java [938:951]:
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  private <T> Map<String, ODataCallback> getCallbacks(final T data, final EdmEntityType entityType)
      throws EdmException {
    final List<String> navigationPropertyNames = entityType.getNavigationPropertyNames();
    if (navigationPropertyNames.isEmpty()) {
      return null;
    } else {
      final WriteCallback callback = new WriteCallback(data);
      Map<String, ODataCallback> callbacks = new HashMap<String, ODataCallback>();
      for (final String name : navigationPropertyNames) {
        callbacks.put(name, callback);
      }
      return callbacks;
    }
  }
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odata2-lib/odata-ref/src/main/java/org/apache/olingo/odata2/ref/processor/ListsProcessor.java [948:961]:
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  private <T> Map<String, ODataCallback> getCallbacks(final T data, final EdmEntityType entityType)
      throws EdmException {
    final List<String> navigationPropertyNames = entityType.getNavigationPropertyNames();
    if (navigationPropertyNames.isEmpty()) {
      return null;
    } else {
      final WriteCallback callback = new WriteCallback(data);
      Map<String, ODataCallback> callbacks = new HashMap<String, ODataCallback>();
      for (final String name : navigationPropertyNames) {
        callbacks.put(name, callback);
      }
      return callbacks;
    }
  }
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