What is meant by the result held in reserve for the previous year by Pune University?

I have a few friends from Pune University. According to them, the result held in reserve can indicate a variety of things as below. If you feel that you cannot fail a subject, then refer to the first point below.

• Result Reserve is frequent when the transfer receipt or eligibility document has not reached the appropriate officials (It happened to one of my friends due to an invalid eligibility document).
• It is in reserve due to backlogs of students.
• The answer sheet might be misplaced or awaiting corrections.
• Sometimes, it can be in reverse, if someone drops a year as they won’t be eligible for the next year. 
• The student fails in the lower examinations.

Overall, the above were the few reasons for which the result held in reserve.