I have several content types with MediaLibraryPicker field. These fields contain PDF files from the media library. I want to display these fields differently for different content types. I can't create alternates in a regular way, because (as I can see) it's not possible to create alternates based on "parent's" content type. Shape Explorer also shows same names for alternates even in different "parent" types. I tried to declare alternates in placement.info files but can't figure out how to specify it. I tried nesting content types:
<Match ContentType="ParentType">
...
<Match ContentType="Document">
<Place Parts_Document_Summary="Content:after;Alternate=My_Alternate"/>
</Match>
</Match>
But it doesn't apply alternate. When I move inner <Match ContentType="Document">
element outside of <Match ContentType="ParentType">
element, it applies to both parent types as it should.
How is it possible to specify different alternates for documents in my case? Any suggestions are appreciated. Thanks in advance.