Human Durable and Consumable Resource Types
One Resource Type must always be the Human Resource, whether or not you have used the default Schema. If your Schema retains the default Schema, then in addition one resource type must have the Durable Resource property, and one the Consumable Resource property. If you select Resource Types in the Project Explorer, the General tab in the Properties View displays a matrix showing which type has which property.
The Resource Type with one of these properties does not have to have the corresponding name. In this example some of the Types have been renamed:
You can change the assignment of these attributes by checking boxes in this matrix - for example, you could check Durable Resource in the Construction machinery line. If you do this, the corresponding box in the Building line would automatically be unchecked: there must be one, and only one Resource Type with each attribute.