Foreign credit check

Good morning all,

I've heard different view on this from banks and from mortgage "experts" and still can't get my head around.

When can banks ask you for a credit check from your home country? Some say that if they see that you have transferred money to a foreign account for the last 6 months before asking for a mortgage, they will require you to get a credit check. Others say that if you haven't, they won't require it and some others say that regardless and since you're a foreigner they'll ask you for a credit check anyway.

Is there a clear rule?

Thanks