A project definition may have conditions or interlocks configured that control when its transitions may be run.
Conditions are rules based on the values of certain folder properties of the project itself or on programming expressions that a system administrator may have defined.
Interlocks are rules based on the values of certain properties of project folders or of documents. Project interlocks apply to the current project or its subprojects; that is, downstream from the project folder. Document interlocks can apply to all, any, or no documents contained with a project folder. Document interlocks can affect the project itself, its parent project, or the topmost project of a project hierarchy; that is, upstream from the project folder.
Transition conditions and interlocks can be simple or very complex. Consult a system administrator for more information on the transition conditions and interlocks configured in your vault.