What might cause the "Open in Parent" toolbar button to not work?

Version 1

    Details

    What might cause the "Open in Parent" toolbar button to not work?


    Resolution

    In the parent-child relationship, you must have be using a "ParentLink" link field on the child -- The "Open in Parent" toolbar button explicitly references the field named ParentLink. Any other valid configuration will stop working, if the link field in use is not named ParentLink.