If any of the Strong references of an Annotation feature are missing, the Annotation feature fails regeneration. If you do not want it to fail, you can either change the reference type to Weak, or reorder the Annotation feature to a different position in the regeneration sequence.

You can reorder Annotation features in the same way as you reorder other types of features:

You can not reorder an Annotation feature to come before any of its references. For example, if the Annotation feature contains a note attached to an edge of a round, you can not reorder the Annotation feature to come before the Round.

For more information on reordering features, see the Part Modeling documentation.