public boolean checkPossibleToEnrolInExistingGroup(IGrouping grouping,IStudentGroup studentGroup,IShift shift)throws ExcepcaoPersistencia;
public boolean checkPossibleToEnrolInExistingGroup(IGrouping grouping,IStudentGroup studentGroup)throws ExcepcaoPersistencia;
	public boolean checkPossibleToEnrolInExistingGroup(IGrouping grouping,IStudentGroup studentGroup,IShift shift)throws ExcepcaoPersistencia;