Cyclone 4 GX150 PLL compensation workaround

I'm trying to deserialize 6 different data channels with 6 different clocks in Cyclone 4 GX150. I have 8 PLLs in the device but still the tool gives error on one PLL if it tries to assign pins automatically.

I remove all assignments and I start compilation. Even without any assignments the tool still gives error/critical warning with PLL compensation problem for some dedicated clock input pins

=> is this mean a or b

a)No matter how I assign the pins the device is not capable. Not possible

b)Quartus tool is not so smart or have bugs while assigning dedicated clock inputs for PLLs. I still have a chance to remove the error by manually editing the location of dedicated clock