For a W-2 that includes no distributions and box 11 represents only vesting of prior-year deferrals (for which you answer No when asked if the amount in box 11 represents distributions), TurboTax should not be complaining about box 11 being less than the amount in box 1 (although it probably should complain if the amounts in box 5 is less than the sum of boxes 1 and 11 because both the amount in box 1 and the amount in box 11 are subject to Medicare tax).
If TurboTax is complaining inappropriately, omitting the amount from box 11 will not affect any of teh calculations on your tax return. Although the details of your W-2 entries will accompany your e-filing, I doubt that the omission would raise any red flags with the IRS.
