The Overallocated field indicates whether any of the assigned resources on a task is assigned to more work on the task, or whether a resource is assigned to do more work on all assigned tasks, than can be done within the normal working capacity.
There are several categories of Overallocated fields.
Data Type Yes/No (Yes/No field: A type of field with content set to either Yes or No; also known as a Boolean field or a True/False field. For example, the Recurring field indicates whether the task is a recurring task.)
Overallocated (task field)
Overallocated (resource field)
Entry Type Calculated (calculated field: A field in which the value is determined by Project based on information in other fields. Project may recalculate the value automatically or when you specify, depending on your choice of calculation settings.)
How Calculated If a resource is overallocated, the Overallocated field contains Yes. A resource is overallocated if the resource is scheduled for more work on all assigned tasks than the resource can do within the normal work capacity. A resource's work capacity is determined by the resource calendar and the resource availability settings in the Resource Information dialog box.
Best Uses Add the Overallocated field to a resource view when you want to review or filter for the resources that have more work than they can do within the allotted time. You can then take actions such as reassigning tasks, leveling resources, assigning other resources, and adding overtime.
Example Several resources have been assigned too much work on all their tasks. You can use the Overallocated field to filter for and view those resources.
Remarks You can also see whether an individual resource is overallocated by viewing the resource in the Resource Graph view.