Try reporting it to see if it could be accepted. http://ordnet.dk/ddo/ordbog?query=bagved https://translate.google.com/?hl=en#auto/en/p%C3%A5%20eller%20til%20et%20sted%20der%20ligger%20l%C3%A6ngere%20tilbage%2C%20p%C3%A5%20rygsiden%20eller%20p%C3%A5%20bagsiden%20af%20noget%20%20%0A%0AAntonym%20foran%20%20%0A%0AEksempler%20omme%20bagvedikon%20for%20korpuss%C3%B8gning%20%20inde%20bagvedikon%20for%20korpuss%C3%B8gning%20%20nede%20bagvedikon%20for%20korpuss%C3%B8gning%20%0ADer%20var%20en%20have%20med%20frugttr%C3%A6er%2C%20og%20bagved%20havde%20vi%20en%20legeplads%20JeEise90%0A%0A1.a%0A%0Aoverf%C3%B8rt%20med%20status%20som%20det%20egentlige%20eller%20som%20den%20tilgrundliggende%20%C3%A5rsag%20til%20noget%2C%20evt.%20skjult%20af%20en%20ydre%20fremtoning%20%20%0A%0A%0Ahans%20musik%20rummer%20%5Ben%20dobbelthed%5D%3A%20En%20overflade%2C%20den%20man%20h%C3%B8rer%2C%20og%20den%20musik%2C%20der%20ligger%20bagved%2C%20den%20egentlige%2C%20%22betydningslaget%22%20Inf92%0A%0A1.b%0A%0Aplaceret%20senere%20eller%20l%C3%A6ngere%20til%20h%C3%B8jre%20i%20en%20r%C3%A6kkef%C3%B8lge

"bag" can be a noun, adverb or preposition. It is used as a preposition in this sentence. "bagved" is an adverb. It can be "bag ved" or "bagved" when used as a preposition. http://ordnet.dk/ddo/ordbog?select=bagved,2=bagved

That means "back" rather than "behind". http://ordnet.dk/ddo/ordbog?query=tilbage

Here it is in accusative case. Han is used for nominative