Thank you for the reply.
I had not thought about that as a means of troubleshooting this problem. If I click the magnifying glass on the 1040 amount, it opens that same amount on line 4b of the 1040/1040SR worksheet. If I hit the magnifying glass icon on that value, a popup window to "Add Form 1099-R" opens and asks me if I want to create a new copy,
So it seems like it has a value that it thinks is there. I am not sure where that value comes from since it does not match the actual 1099-R value that I am trying to enter. In any case, TT thinks there is an existing value that is not linked to any source data.
