If the Assign button is not visible on the toolbar, the security role A defined set of privileges. The security role assigned to a user determines which tasks the user can perform and which parts of the user interface the user can view. All users must be assigned at least one security role in order to access the system. assigned to your account does not have permission to assign this type of record. To check your permissions for a specific record, open the record, click the File menu button , and then click Properties.
More information about specific permissions and performing this task while offline: Common Task Permissions