Suggested method for data input

We have a stock that was inherited years ago.  We have carefully kept track of basis and associated cost parameters.

 

It was sold last year and the 1099-B from the Broker showed a cost basis of $0.00.  I have replaced that value with the appropriate cost as I entered the data into TT.

 

What is the suggestion to make sure that this does not raise a flag with the IRS?