Social Security Duplication Patch
If you installed upgrade 7.0.04 but do not wish to be prevented from using duplicate Social Secuirty Numbers for multiple employees in cases where the same employee is listed multiple times, please install the following patch.
Make sure to close C21 before installing. This patch will allow C21 to display a message warning you of a duplication but will not prevent you from having the same SSN for multiple employees.
http://www.c21accountingsoftware.com/C21/Download/PR_SSN_Dup_Update.exe