To Delete References
1. In an open assembly, select a component, and perform one of the following operations:
Right-click and select Information > Reference Viewer
Click Model > Reference Viewer
Click Tools > Reference Viewer
The Reference Viewer dialog box opens.
2. Select a missing or an existing reference, right-click, and choose Delete Reference from the shortcut menu. A message window opens.
3. Click OK to delete the selected missing references.