Retro error in Payroll

Hi,

For some reason the following error only shows up when I run actual Payroll. When running a test run, it shows up in the log as a warning but still runs and I get results. More so when running without log - I get a perfect pay slip with all the right amounts.

How is it possible that the simulation doesn't really reflect the actual situation?

This is the error/warning:

RA run too early for payroll area 77
Earliest retroactive accounting period: 2013 01

Retroactive accounting date for employee: 01/03/2009

Thanks in advance.