Looking for a better way to manage journal entries. QBO has a lot of power here, but the UI is difficult to work with when you have a large number of entries (especially when they come from a lot of third-party sources).
There are a lot of mid-market solutions (R2R and JEMS type stuff), but I can't find anything for QBO or small businesses..
I'll help you out with your concern about managing journal entries.
I suggest taking a look at this page: QuickBooks App Store. It lists all 3rd party apps that can sync with QuickBooks Online (QBO). Although I'm unable to provide a specific app for your query, you can either use the search box in the middle of the page. You can also scroll down and select a category that suits your needs.
In line with journal entries, take a look at this article: Mixing currencies in journal entries. It will walk you through on how you can locate issues within a journal entry that contains different currencies. It also has the steps on how you can fix them.
Feel free to drop a comment below if you need further assistance.