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TMS320F28388D: Input Xbar Select Register Not Setting

Part Number: TMS320F28388D

I'm trying to set the Input Xbar register for input select 7 to GPIO 16.

The current code I have is 

InputXbarRegs.INPUT7SELECT = 0x0010;

This line does not set INPUT7SELECT register as viewed during debugging it stays 0xFFFE. It seems like this is protected because I can use the debugger to set the register to correct value and it works!

Background:

I'm using the provided f2838x_headers_nonBIOS_cpu1.cmd to memory map the register structures to the processor.