PLL_T2_CLKOUT3、PLL_T2_CLKOUT4 and PLL_T2_FBp/CLKOUT1、PLL_T2_FBp/CLKOUT2

Hi

I have a PLL to drive two PLL output pins,such as PLL_T2_CLKOUT3 and PLL_T2_CLKOUT4.And this is ok.

While changing to PLL_T2_FBp/CLKOUT1、PLL_T2_FBp/CLKOUT2,Quartus has the warning: "feeds output pin via non-dedicated routing".why?

I thought thatPLL_T2_FBp/CLKOUT1 and PLL_T2_FBp/CLKOUT2,they are Dual-purpose I/O pin that can be used as a single-ended output.

regards