By default, the drawing manager hides the centerlines of tube, pipe, and hose routes in drawing views. Centerline recovery is used to control the capability to dimension to underlying centerlines within routes in active tube and pipe drawing views.
You must dimension routes to the centerlines in orthogonal drawing views. Otherwise, you may receive incorrect dimensions. When the specified route centerlines are recovered, you can dimension routes to the centerlines. If you change the centerline recovery back, all recovered centerlines in the active drawing views are deleted. Associated dimensions may disappear or become incorrect.
Note: When a new route or run is created and populated, the route centerline in drawing views has the same centerline recovery setting as the parent level. To add or remove centerlines for other Autodesk Inventor components in a standard assembly, change the Automated Centerline Settings on the Tools tab 
Options panel Document Settings Drawing tab.
Options panel Document Settings Drawing tab.