A lesson I learned the hard way: When I started working on Oracle HCM conversions, I assumed that loading workers would be one of the simpler parts of the project. Every HR system has employees, so the process seemed straightforward: extract the employee information, transform it into HDL, load it into Oracle, and move on. That assumption changed during an early conversion cycle. I was troubleshooting a worker load that looked correct. The syntax was valid, the person number was present,...