RE: Undo/Open Posted Bank Reconciliation
Hi,
I don't believe you would be able to see Undo action in version 15 of BC as it was arrived after 18 version.
But here is workaround you can do
1. Unapply all applications that that resulted from the posting of the bank reconciliation.
2. Reverse the transaction.
3. Redo
If my answer was helpful to you, please verify it so that other users know it worked. Thank you very much.