Why can't you take out a mortgage from a foreign bank?

I'm sure there is an answer to this and I'm hoping someone on here will know... So what is stopping an Irish house buyer from taking out their mortgage with a bank located in a different country?

I can understand the exchange rate risk if you were to take out a mortgage from say from a UK bank which I presume would be in GBP, but how about another EUR jurisdiction?

Not sure that rates are lower in other countries either, haven't investigated it, but I'm just wondering if it's even possible?

Thanks

The general answer is that a foreign bank may not be interested in your business, unless they are prepared to do the legal work in Ireland to have the mortgage attached to the deeds of your property and deal with the Irish legal system in the event of you defaulting.