Quartus-II - Error: Can't place multiple pins assigned to pin location Pin_D11 (IOC_X

Hello,

I'm using Quartus-II V8.1 with a Stratix-II (EP2S15F484C3) and trying to compile a very

simple application and getting the error:

Error: Can't place multiple pins assigned to pin location Pin_D11 (IOC_X15_Y27_N0)

Info: Pin TEST_INP is assigned to pin location Pin_D11 (IOC_X15_Y27_N0)

Info: Pin ~nCSO~ is assigned to pin location Pin_D11 (IOC_X15_Y27_N0)

The application has four pins defined. Two input and two output pins, such as:

INPUT (PIN_AA18) ---> OUTPUT (PIN_U12)

TEST_INP (PIN_D11) ---> TEST_OUT (PIN_D12)

I went to "Assignments->Device->Device and Pin Options->Dual-Purpose Pins" and tried

to change "ASDO,nCSO" to "Use as regular I/O", but appears as if the only option

is "As input tri-stated"

The configuration is set to "Active Serial" using a EPCS64 configuration device. The board

has this configuration device.

Also, the pin (D11) is defined as an input pin in the design. Does anyone know of a

solution (other than not using the pin)?

Any help is appreciated. Thanks!