Event ID - 284

Event Id284
SourceMSExchangeDSImp
DescriptionCould not modify the DL membership of object <<DN of recipient>> because the directory service reported the following error: Changes cannot be written to this directory object. Try connecting to a Microsoft Exchange Server computer in the same site as this object.
Event InformationAccording to Microsoft:
CAUSE:
The above error occurs if you attempt to import a mailbox or custom recipient that includes a "Member of" attribute that points to a distribution list from a different site. The recipient gets created but import cannot add the recipient to the membership list for the given DL. This is because an object that does not belong to the directory on the local site cannot be directly written to.
This situation is common when you are using an exported list of users from a particular site. When you do this, the "Members" attribute is also exported. This attribute contains the distinguished name (DN) for any distribution list the recipient is a member of, including distribution lists (DLs) from external sites. As stated above, the local import function cannot modify attributes from external sites, so the function fails.
WORKAROUND:
To work around this problem, do one of the following:
Manually add the users to the DLs through the external site,
-OR-
Create a new import file to add the users to the DL membership.
Reference LinksXADM: Could Not Modify the DL Membership of Object

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