Removing metadata schemas for particular PDFs

Hi all,


am trying out 3.18.4 and am trying to get the following situation to work:



Most of our publications are delivered as PDF files but we have a html "splash page" (Standard page) that sits above them as a parent to introduce the publication, show a thumbnail of the cover and link to the PDF.



I would like all PDFs that are created below one of these special spash pages to have all their metadata schemas removed.



How would I do this?



My first idea was to create an asset builder to create the splash page and set the link value to "Publication" and then use a trigger that has a condition that says if any PDFs are created with a parent with a link value of "Publication" then remove all metadata schemas.



But that trigger doesnt seem to fire - the "Optional items for Advanced users" in the "Child/Parent" condition doesnt seem to fire properly.



Is there something I'm missing with this trigger condition? The documentation is a bit hazy on these conditions…



Or, more importantly, is there a better way to do this?



Thanks,



Steve