I cannot imagine how you accidentally released an invoice to accounting - it would have been easier to suggest a more efficient way to find the document if you have explained how exactly this happened.
For example, if you did it via VF02, you could just check the most recent entries from the history.
Anyways, these two options should work no matter from which transaction you did it - as release to accounting results in a FI posting.
A. You can check in BKPF with your user ID as usnam, date as cpudt, some meaningful time range in cputim, awtyp = VBRK and obtain the list of accounting documents. There won't be that many if you restrict the results well and if you did not release many documents. From the FI document it is easy to navigate to the invoice (environment->original document). Or use AWKEY... You can also restrict by tcode in bkpf.
B. If you prefer user transactions - there is a document list accessible from FB03, where you can specify entry date, 'own documents only' indicator and reference transaction VBRK, additional selections like transaction code etc. From there it should be easy to get to the billing - double-click to navigate to FB03 then environment->original document.
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