Detailed Drawings > Annotating the Drawing > Cleaning Up Dimension and Detail Display > To Reroute Dimensions with Lost References
  
To Reroute Dimensions with Lost References
Lost dimension references may occur when 3D parts or features are suppressed, or during feature redefinition. Lost references in a drawing are highlighted in a unique color.
1. Click the lost dimension to reroute and then use the right-mouse button to use the shortcut menu.
2. Click Edit Attachment to reroute the dimension to new references.