How to enter an Estonia IBAN in vendor master data?

Hi,

We got a vendor from Estonia, for which I have to enter the IBAN in the vendor master details.

I can't figure out how I do have to create the bank key to generate the IBAN.

I have found the structure, but what should be the bank key and how to enter the bank account, so SAP is able to generate the IBAN

estonia.jpg

estonia2.jpg

Any help is welcome!

Thanks.