As Section pointed out, that's the point of a rookie contract. Teams can actually go between 80% and 120% of the scale value for each draft slot, but basically everybody goes to 120%.
BUT: Things work a bit differently for players who play internationally instead of in the NBA after they are drafted. In the first three seasons following the draft (for Bogdanovic, that's '14-'15, '15-'16, and '16-'17) the NBA team can only give the rookie scale. Starting in the fourth year after the player is drafted, the team may still use the rookie scale, or they may sign the player as a free agent (though they have to have the cap space to do so). So starting next year, Bogdanovic can get a significantly bigger paycheck, which is why he's not electing to come over this year.