Pin assignment problem

[Altera_Forum]

i'm using quartus ii 9.1 with incremental compilation and i have thie error message "can't place multiple pins assigned to pin location w9 " but in pin editor allows to place that pin and one only pin is assigned to that location. what's happening is there a known bug?. 

  Thanks

[Altera_Forum]

Hi, 

 can you tell which device you are using? I think you´re problem has to do something with the configuratiuon pins of your specific device.

[Altera_Forum]

Did you expand the error message? It should have more details about conflicting assignments.

[Altera_Forum]

Hi, 

no conflict with dedicated pins, the conflict is with another pin whose assignment is made from the fitter and not form me. I am using an EP2C35. Why the fitter assign some pin location?

[Altera_Forum]

Hi, 

 if the case is F484 you should get no problems. You are right. What kind is the second assignement. Can you give some detailed information?

[Altera_Forum]

The only automatic assigned function for pin W9 of EP2C35F484 is differential pair with Y9. But as said, the full error message text should tell.

[Altera_Forum]

Tx_Ena_Block_New:inst|clk_tx[5] Location PIN W9 QSF Assignment Tx_Ena_Block_New:inst|clk_tx[5] Location PIN G5 Post-Fit Property 

 After a compilation with all design blocks with postfit preservation level I find this "fitter incremental compilation conflict" I have assignd the output to pin W9 but it seems it is assignd automatically to G5. I don't understand why. In the resource section repot I find many output pins i have assigned as virtual assigned to a phicical output by the fitter? Why?