Cannot Delete Imported Transactions

I have four transactions/transfers that I imported that appear under my Cash account. I no longer need these as they were entered incorrectly. Each of these is listed under the Transfer Category.

Every time I go to Banking -> Transactions, the transactions that are there, I am unable to delete, and I only receive an "Unauthorized" message.

When I go to Transfers, these items are not there. So I'm confused and generally, just need to remove these four transaction/transfers.

Any ideas?