The publishing process in Microsoft Office Project Professional 2007 has been modified so that all fields (field: A location in a sheet, form, or chart that contains a specific kind of information about a task, resource, or assignment. For example, in a sheet, each column is a field. In a form, a field is a named box or a place in a column.) are published at once and all assignments (assignment: A specific resource that is assigned to a particular task.) are sent to all resources (resources: The people, equipment, and material that are used to complete tasks in a project.). As a result, you can no longer publish only the new assignments in your project.
Note Once a task has been published, only changed fields will be republished. If you don't change any data on a task, the publish process will not resend the task data to Microsoft Office Project Server 2007.