The design should be applied to the children standard page assets only, not the parents, as these are static pages that don't need triggers to apply new designs.
Any ideas what could be going wrong with the trigger?
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You need to set another condition to only apply it to Standard Page assets, because right now it is trying to add it to that and all its children.
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Wow something that simple eh… many thanks Nic, that did the trick!
and I wanted a trigger to apply one design to the child - level 1 assets and a trigger to apply a different design to child - level 2. What conditions would work in this scenario so the right childs receives the correct design?
Bearing in mind that both level 1 and 2 child assets can't be selected as root nodes as they get created on the fly every time as required.