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As per @AbrahamT above, try deleting your Form W-2 and reenter it, leaving that number blank. 

Make sure that the proper state is selected for Box 15.  

If a specific number of digits is required, try shortening your number to that format.

To delete a W-2 entry:

1. Open your return in TurboTax.
   (To do this, sign in to TurboTax and click the blue Take me to my return button.)
2. Using the search feature in the upper right, search for "w-2" (lower case, with or without the dash) and then click the "Jump to" link in the search results.
3. A W-2 screen will open. On this screen you can delete the W-2 entry

To manually enter your W-2 info:

1. From Tax Home, open or continue your return.
2. In the search bar, search for W-2.
3. Select the Jump to link at the top of the search results.
4. At We'll start with your W-2, select Work on my W-2 and Continue.
   • If you land on the Here’s your W-2 info screen, select Add another W-2.
5. Leave the employer ID section blank and Continue.
6. Select Type it in myself and Continue.
7. Follow the instructions to manually enter your W-2 info.

This should enable you to bypass the issue and file your return.

Click here for additional information on deleting forms in TurboTax.

Please feel free to come back to TurboTax Community with additional information or questions or click here for help in contacting Turbo Tax Support.