When performing the year end, follow the above procedures and also run the year end purge program. After the year end purge is accomplished, you may then generate T4's for the year. You can not process T4's until the year end purge is completed. Once the year end purge is completed, you can not do any further payroll processing for the year.
Only in the payroll system are both month end and year end purges done during year end processing.