Currency risk, foreign exchange risk, exchange risk.

foreign exchange risk hedging instruments (historical rate rollovers. excepted). Nor will it include investments in equity instruments or other ...
www.rbnz.govt.nz/finstab/banking/regulation/bs2.pdf -
intentions and its ability to use policy instruments to .... or services that have some protection from foreign. exchange risk because local currency ...
www.partnershipsforwater.net/en/instruments/TC_Tools/075F_E...

This can refer to just to effects from changes in the rate of exchange. You can find lots of references to it in macroeconomics papers on governments managing monetary policy and not necessarily in contracts.

Here is are links to a paper written in English and translated into Spanish (a good translation).

P. 9 in the English version --
This dilutes the exchange rate impact of running persistent current account
deficits for two reasons.

and p. 7 in Spanish --
Esta circunstancia atenúa los efectos cambiarios derivados del mantenimiento de déficit por cuenta corriente persistentes por dos razones.

http://tinyurl.com/256taq
http://www.tcd.ie/iiis/documents/discussion/pdfs/iiisdp129.p...

While there probably are formal "instruments" in the case discussed in your context, that isn't what this particular phrase is saying. I just witnessed how the exchange rate can affect the negotiation to buy property when a Canadian friend bought in the US with a Canadian loan. The exchange rate had tilted in her favor, but had it not, she would have come up short on funds to cover the purchase.

an option :)