How to deal with this DFT warning

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tigerajs

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The shfit_enable used the internal module pin for pin mux, and after syn, it display as follows: Cannot idealize the test signal(DFT-199)

How to solve it, or ignore this warning? Thanks
 

Check your constraints file. May be you have set the shift_enable signal as an ideal network.
check for the following string
set_ideal_network
 

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