Mass Operation Replace - Error - Duplicate Key Row?!

Yes, the part often has the same operation on multiple times… Each time I run it errors with the part number that is the problem. If I open that part in Eng Workbench, I can manually change the operation, then re-run Mass Part Replace. Then, I get the next part number and do the same manual fix. Some operation changes only require 6-10 part numbers with problems. However, last week the last operation I did required 30+ manual changes… I’m concerned that the next few updates will require waaay more than 30.

Stuck… hmm.