Coworker not doing their job
As part of my job, I have to make some calculations and input them into the computer system. As a part of my coworker's job, he is to then take my numbers and make a couple of adjustments which increases the accuracy. 99% of the time, my coworker is not doing it or does it very late, which has no positive effect on the accuracy of the numbers. The accuracy is reflected on my performance targets, but not his...so it's easy to see why he has no motivation to do it, althought it is still part of his job responsibilities. A former coworker had the same issues with this person.
I've spoken to him about it in a very non-confrontational way and send him reminders to do them every couple days, but it generally leads to "oh..yeah i'll do them this afternoon". I know the most obvious solution is to talk to my manager, but I'm hesitant to do so because I'm still new to the job (only been there a couple months). And as such, I still have a lot of questions about things... and this coworker has always been very open to answering these questions and providing me ongoing training. I don't want to that to be affected because there is still a lot for me to learn and I don't want to get him in any trouble when he has been helpful in other areas. On the other hand, although i'm not at risk of being fired or anything, I don't like having performance numbers that are lower than they should be.