So my boss asked me to create an integration with a governamental program. This integration consisted in a text file being sent in a monthly basis.
Months later, he asked a coworker to automate the process, since the appointed user was finding the work too..."tedious",and asked me to check on the former regularly.
Thing is, everytime I checked, I saw a change being done in the core of the business layer, and I intervened, saying that those changes were either unnecessary or wrong altogether.
After three of these interventions, said coworker asked my boss to "ask" me to stop, and let him do his work. The boss concedes.
At the end of the week, my boss asked me to review the final product, and assert whether it conformed to our patterns.

After said review, he asks me why I've denied the work, to which I answer "a) the rules were changed by (the coworker), and are no longer correct, b) the the automator still requires a user intervention, and c) it threw an exception in the first time I (and I guess we) tested".

The job was placed in my time line the following day.