See if you have given the examination in a OMR sheet then writing wrong codes can create problems while checking and your answer sheet may get rejected. If you have given descriptive type examination, then it would not create much of a problem. For OMR machine, on the basis of Question sheet code, the options are marked by the machine, so providing wrong code creates problem in case of OMR.

For more information regarding OU you can consider the link below:

https://www.careers360.com/university/osmania-university-hyderabad

I hope this helps. Wish you a great eve!