Sequential element is unused and will be removed from module

Hi,
I meet synthesis issue of;
[Synth 8-3332] Sequential element (\IDQUEUE/WCNT_reg[4] ) is unused and will be removed from module CMH.
The WCNT register and IDQUEUE module are removed from design @ synthesis. 
At simulation the module and reg are there.
Does anyone know reason why this warning is occurred, and how to fix?
ps.
IO pin is not assigned.
 

Hi 
Please refer to AR: http://www.xilinx.com/support/answers/54778.html
Thanks,
Tushar
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