Difference between recalling witness and re opening case

If the evidence of either side is closed then that side cannot recall its own witness or any other witness to depose further evidence in its side without reopening the evidence of its own side.  A simple recall of the witness is done when the evidence on its side is kept open, to depose further evidence by the said witness.  In your case, during your chief examination if the GPA deed was omitted to be marked, you may be recalled to mark the particular document as exhibit on your side after which the opposite lawyer may cross examine you over the evidence you deposed lately.