Line 18 isn't included on a standard Form 1099-B, so I'm not sure what information is being requested. There is a line 18 on a W-2 form entry, for local wages. I suggest you make sure the request is referencing a Form 1099-B entry. You are correct that an entry of a nominal amount here will have a negligible effect on the accuracy of your tax return, assuming Form 1099-B is being referenced in the error message.
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