did you have wash sales or some other adjustment? when those are put in as part of sales summaries instead of "one by one" it will trigger a need to mail in the 1099-B.
One way to avoid this is by splitting the 1099 into two parts - just the specific sales/lots with wash sales (for example) need to be input at the "one by one" detailed level (with the asset details and acquisition/sale dates etc); the rest can be put in as summary level but you have to calculate the new summary totals excluding whatever was put in at detailed level.
Not a CPA/Expert but this has been my experience with this issue on TT desktop premier version - not sure about TT online version; and I usually manually input my 1099-B's I don't know how import treats this.
