Use the "Delete a Form" tool to
remove the Schedule K-1 (and any
associated worksheets).
See: How do I delete forms in TurboTax Online?
After deleting the Schedule K-1, log out of the
program. When you log back in, use the Delete a Form tool to confirm
the Schedule K-1 has been removed from the list of forms in your
return.
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.