Međurečje is well known to be the only exclave of BiH, and is recognized as such by international law and both Serbia and BiH. There are currently talks about a potential territorial swap to mitigate this, but as of writing, this recent change is just completely unfounded. 
(Katastar Srbije takođe vodi ovu teritoriju kao da pirpada njoj, tako da ukoliko postoje dvojake i podjednako važeće informacije, sa pravne strane gledano, mislim da nije ispravno delovati na osnovu jedne, koja pritom ide protiv dobro ustanovljene i međunarodno priznate granice.)