Active Directory Lightweight Directory Services encountered a write conflict when applying replicated changes to the following ...

Active Directory Lightweight Directory Services encountered a write conflict when applying replicated changes to the following object. 
 
Object: 
%1 
Time in seconds: 
%2 
 
Event log entries preceding this entry will indicate whether or not the update was accepted. 
 
A write conflict can be caused by simultaneous changes to the same object or simultaneous changes to other objects that have attributes referencing this object. This commonly occurs when the object represents a large group with many members, and the functional level of the forest is set to Windows 2000. This conflict triggered additional retries of the update. If the system appears slow, it could be because replication of these changes is occurring. 
 
User Action 
Use smaller groups for this operation or raise the functional level to Windows Server 2003.