1. create required basic setup along with employee and do payroll for that one.
2. open modify paychecks screen and try to modify the check# with already existing check# will appear the following alerts.

i) modify check alert click on YES
ii) Retained as void click on NO
iii)Duplicate alert click on YES
------- should create duplicate check only , here its creating with void check for the old check# and duplicate for the new check#-----

screen rec:
https://drive.google.com/file/d/1dBYNN_LILYdBGayfd3z6dUsN4OjSdylr/view?usp=sharing