| Possible values |  |
| Activity A project activity structure, defined in the Activities (tppss2500m000) session for the project. Element A project element structure, defined in the Elements (tpptc1500m000) session. Cost Component A cost component structure is a flat structure, defined in the Cost Components (tcmcs0148m000) session. Extension An extension is created in the Project Extensions (tpptc0510m000) session. User Defined A user defined structure is the only structure type that can be defined more than once for a version. A user defined structure can be, for example, an organization breakdown structure. |