Well it is from the new Zealand atpl syllabus for systems and performance. Syllabus item 48.27.2a
"state the relationship between configuration and maneuvering speed."
The closest my book gets to explaining anything about maneuvering speed is under the definition "flap maneuver speed" which states:
Flap maneuver speeds allow full maneuvering capability (25* bank with a 15* overshoot). Full maneuver margin exists for all normal landing procedures whenever speed is at or above the maneuver speed for that current flap setting.