I think its a Driver limitation, I heard it might change in the future. it would be nice if the APU Radeon could talk to the PCIE Radeon. But you better off using a more powerful card then doing Dual Graphics.
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Imagen if you could use the R9 270X and also use True audio from the CPUs Radeon, my dream is that it will be possible someday
also This is what AMD though up but Dual Graphics and Crossfire is diffrent so you might confuse people if used the wrong term.
Dual Graphics = APU GPU and a DGPU talk to each other work with each other. (Example A10 7850 Radeon talking with a R7 250)
CrossFire = Two DGPU are connected with each other and talk to each other (example Two R9 280X connected in a PCIE and connected with a bridge cable)
I am sorry if I sound like a know it all.
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I also confused alot of people with this.