I have a board for loans. The borrowers are set up in the Accounts board. A loan can have a borrower and a co-borrower.
I set up a Borrower column and connect it to the Accounts board, and then I can mirror in other info from the account (address, etc.)
Then I set up a Co-Borrower column and connect it to the Accounts board. I can select a different Account. But I cannot create a mirror column on Address on Co-Borrower because (it appears) that since I mirrored Address in the Borrower column, it will not let me mirror it for the Co-Borrower column, even though it is a different Account. Is this correct? Why would it only allow it to be mirrored once?