This excerpt taken from the LUX 20-F filed Jun 28, 2006.
Change of currency
(a) Unless otherwise prohibited by law, if more than one currency or currency unit are at the same time recognised by the central bank of any country as the lawful currency of that country, then:
(i) any reference in the Finance Documents to, and any obligations arising under the Finance Documents in, the currency of that country shall be translated into, or paid in, the currency or currency unit of that country designated by the Agent (after consultation with the Italian Borrower); and
(ii) any translation from one currency or currency unit to another shall be at the official rate of exchange recognised by the central bank for the conversion of that currency or currency unit into the other, rounded up or down by the Agent (acting reasonably).
(b) If a change in any currency of a country occurs, this Agreement will, to the extent the Agent (acting reasonably and after consultation with the Italian Borrower) specifies to be necessary, be amended to comply with any generally accepted conventions and market practice in the Relevant Interbank Market and otherwise to reflect the change in currency.