Credit Memos not included in Invoices when using Bank Receipt File Import

I am implementing the Bank Receipt File Import functionality using a custom EI file. It mostly works, except that the AR Invoice list for matching does not include credit memos. I thought this was an issue with my custom EI file, but after testing with a built in EI file (CZ_Bank) it behaves the same way.

Has anyone used this functionality before and knows if this is expected behaviour? Is there some reason credit memos can’t be included here in order to make reconciliation easier?

I’ve also found that when entering a parent account, invoices of child accounts do not show up either, even though it does in Cash Receipt entry. Is there any reason why the bank import file matching is so much more limited?