It appears to be a typo in the DN of the memberOf attribute. Active Directory does not have a container (CN) called "Computer Groups" - only the "users" and "computers" serve this purpose. Rather, it is most likely that "Computer Groups" is an organizational unis (OU).
Thus the path is most likely: CN=Computer s-ERPM-DMSProd,OU=Computer Groups,DC=xxxxxxx,DC=com
Hope that helps.
Support
support@liebsoft.com
_________________________
1900 Avenue of the Stars, Suite 425
Los Angeles, CA 90067
http://www.liebsoft.com
Main: (800) 829-6263
International: +1 (310) 550-8575
Fax: (310) 550-1152