if a teacher has done minor mistakes in checking exam papers,is she entitled for any disciplinary action?

As a teacher, I think it is critical for careful
correcting to be done as a matter of course.  Students want credit for every correct
answer. As a teacher,however, we all have made mistakes simply because we are human, and
these are described as minor mistakes.   I would tell students that if they found a
mistake, to please discuss it with the teacher so that the paper could be corrected. I
would apologize for the error made and then compliment them for looking at the paper so
carefully. The idea is to make them aware that they are in charge of their learning in
so many ways, and looking again at their own work is one of
them.

The other issue raised is a bit scary to me.  I have
never seen any schools (10) in which I taught see this as a disciplinary issue unless
the administration felt the teacher was truly incompetent.This question may involve
union issues as well because of the threat of disciplinary action.  Any teacher in this
position should be advised to see the union representative for
information.