FI posting issue

Hi

I have an employee (employment status = inactive, from sep-2010), for whom I am unable to do the FI posting of the payroll results (regular run) for the month of feb 2011 (ie. my current month). The system is showing an error "Posting balance is not cleared (Period 09/2010 P)".

His payroll results of Dec 2010 (09/2010) was not posted to FI due to same error mentioned above. However I could post his payroll results (off-cycle & regular) of Jan-2011, off-cycle payroll results (off-cycle & regular) of Feb-2011.

Please advise me a way out to clear out this posting issue.

Thanks in advance