You will have to delete the Form 1099-R and re-enter it in the 1099-R interview.
Why does this happen? Once you enter (or import
or transfer) certain information, the program creates or updates forms and
worksheets that use that information. In many cases, you cannot
"change" that information in the interview process - in a manner of
speaking, it has been "written in ink" on the forms. You have to
delete the form and any associated worksheets in order to correct
See: How
do I delete forms in TurboTax Online?
After
deleting the Form 1099-R, log out of the program. When you
log back in, use the Delete a Form tool (List of Forms in My Return) to confirm it was removed from your return. Then, go back to the Retirement
Income and Social Security interview to add the 1099-R back in.
