Hi Jason,
No problem. I ran a DEXSQL.log of the process of assigning an overtime code to my employee and other than the UPR00100 table for the employee master, and the Workers Comp table UPR40700, I didn't see anything else besides the 2 tables that I had mentioned previously that would come into play with this. My recommendation would be as follows to narrow down the issue.
1. Does the issue only occur if you use Quick Assignment? If you manually assigned the overtime pay code to a new employee do you see the same issue?
2. Do you have any Third Party Products or add-ons or products installed that could come into play here?
3. Can the issue be reproduced if you create a new Overtime pay code? This would help eliminate whether their might be an issue with the data on your specific overtime code versus an overall setup issue in your company.
It might be best to set up a test company with a copy of the live company for this testing.
"How to set up a test company that has a copy of live company data ":
support.microsoft.com/.../871973
If none of these suggestions end up helping you narrow down where the issue is, it might be best to open a support case where we can do some more hands on digging into this issue with you to figure out why is different in this company versus other instances of GP.
I hope this helps!
Isaac Olson
Microsoft Support