A 20-year-old man's been arrested after a reported assault on the Crown Range in late March

Late in March, a 21-year-old told Police he was flagged down about 10pm by a stranded motorist.

He says he was then assaulted and robbed of his backpack and contents.

But, Police have now found out the pair knew each other -- and pre-arranged the meeting, which was actually at a Coronet Park carpark.

The arrested man is due to appear in Queenstown District Court on Monday.

The victim is expected to be charged with making a false statement to Police.