Omnibus sentence. (Law school bar/oral question)

Omnibus sentence is a single sentence  for  all  offences of which an  accused  person  has been found guilt  in  a single trial.

Note: According  to  Justice  Chipeta in  Magistrate’s  Manual  pages 140  to  141, it  is wrong  to pass Omnibus sentence where  the accused person in  convicted  on two  or  more counts in  trial because the  sentence must  be  passed  on each  count  separately.