multiple instances of brokerage acct created on import; can't delete

I created QIF files in Quicken 2007, one per Quicken account, and imported each into kmymoney2. For one of my brokerage accounts, about a dozen instances were created in kmymoney2. This, and many other accounts, turned up even though I did not export QIF files (I want to start over as of this year). While I have been able to delete the other dormant and closed accounts, I'm unable to get rid of any of the instances of this brokerage account -- the Delete Account item on the Account menu is greyed out.

I suspect it has something to do with there being multiple appearances of this one brokerage account, as I was able to delete the other accounts which appeared only once. I figured out pretty quickly that the ledger for the account targeted for deletion needed to be opened, in order to enable the Delete Account menu entry.