Currency issue


Here is my issue:
I would like to select a Bank facility agreement from Bank facility agreements choice list in a Letter of Credit but, even after setting the Bank facility agreement needed, the latter is not showing up in the choice list.
We suspect this happens because the Bank facility agreement and the vendor’s currency are not the same.

In case our assumption is correct, what are conditions and requirements to make the Bank facility agreement show up in the choice list? (Even if it’s currency is different than the vendor)
Any help will be appreciated.