You will have to delete the form that has the wrong EIN and re-enter it in the appropriate interview.
If a Payer's EIN is incorrect and
you can't change it in the interview, then use the "Delete a Form" tool to
remove the form (and associated worksheets, if any).
See: How do I delete forms in TurboTax Online?
After deleting the form (and associated
worksheets, if any) log out of the program. When you log back in, use the Delete a
Form tool (List of Forms in My Return) to confirm the form has been removed
from your return. Then, go back to the appropriate interview to add it back in with the correct EIN.
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.
