Oracle Payroll came with a new feature on top of 12.1.3: Quick Retropay. We had build a similar functionality ourselves before, but it is good to see we have it now out of the box.
Quick Retropay comes as a concurrent program. You specify the assignment and a date where you want the retro entries to be created. The start date is optional. The program is smart enough to find out from where to start the recalculations.
Next on my to do list is some performance profiling of the concurrent program, so that Quick means Fast.