code: @Nullable
    public IVATItem findFirst (@Nonnull final Predicate <? super IVATItem> aFilter)
    {
      return CollectionHelper.findFirst (m_aAllVATItems.values (), aFilter);
    }
docs: Find the first matching VAT item.
  
  @param aFilter
  The filter to be used. May not be <code>null</code>.
  @return <code>null</code> if no matching item could be found,