What does it happen if I request availability with a currency that the supplier doesn´t accept?

In these cases, there are two possible scennarios:

• Exchange rates can be applied using a currency conversion plugin (this plugin contains the exchange rates previously loaded by client rules)
• Not applying any exchange rate. In this case, you will receive the supplier´s currency - some suppliers accept the currency in the request and others will return their currency, depending on your account as client with them.