docs: private Method getPropertySourceMethod(Object sourceObject,
  			Object destinationObject, String destinationProperty) {
  		BeanToBeanMapping beanToBeanMapping = beanToBeanMappings.get(ClassPair
  				.get(sourceObject.getClass(), destinationObject
  						.getClass()));
  		String sourceProperty = null;
  		if (beanToBeanMapping != null) {
  			sourceProperty = beanToBeanMapping
  					.getSourceProperty(destinationProperty);
  		}
  		if (sourceProperty == null) {
  			sourceProperty = destinationProperty;
  		}
  
  		return BeanUtils.getGetterPropertyMethod(sourceObject.getClass(),
  				sourceProperty);
  	}