http://newsok.com/oklahoma-city-thu...ve-was-the-right-move-for-okc/article/3898350
A look at the other assets obtained in the Harden trade
Beyond the two rotation players OKC currently has in uniform — Jeremy Lamb and Steven Adams — the Thunder received other assets in the James Harden trade.
Here's a closer look at some of the fringe benefits:
1. First-round pick — The Thunder owns Dallas' first-round pick, but it comes with a caveat. The pick is top-20 protected through the 2017 Draft, meaning the Thunder will only get it if the Mavericks select between 21-30. If still available in 2018, it becomes unprotected. But at this point, the pick serves as an intriguing trade chip more than anything else.
4. Trade exception — Kevin Martin's offseason departure to Minnesota didn't leave the Thunder empty-handed. In a complicated sign-and-trade maneuver with the Wolves, OKC received a $7 million trade exception, allowing the Thunder to manipulate the financial limitations in a trade within the next year and potentially add a chip. This was a direct result of getting Martin in the Harden deal.
Okc has one year to use the trade exception, I think Presti will use it somehow around trade deadline... 7 million is pretty good for a soilid player.

So can they use the 7 million trade exception and trade Perkins whose salary is 8.4 mil for a player worth 15 million?
7 Million trade exception
+8 Perkins
__________
15 million