code: @Nonnull
    public static IMutablePriceGraduation createSimple (@Nonnull final IMutablePrice aPrice)
    {
      final PriceGraduation ret = new PriceGraduation (aPrice.getCurrency ());
      ret.addItem (new PriceGraduationItem (1, aPrice.getNetAmount ().getValue ()));
      return ret;
    }
docs: Create a simple price graduation that contains one item with the minimum
  quantity of 1.
  
  @param aPrice
  The price to use. May not be <code>null</code>.
  @return Never <code>null</code>.