Xcode: Cannot change target membership for folders

I have a number of folders in my Resources group. I want to include some of them in target A and some in target B. To this end I created two subfo开发者_运维知识库lders:

Resources
 - content
 -- A
 -- B

If I try to change target membership for 'content' I can, under 'Get Info', select the targets. If I try the same for 'A' and 'B', under the 'Targets' tab, there are no targets listed.

Anyone have a hunch what the problem might be? Not possible with subfolders?

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I guess it is because you set the target membership recursively, so a subfolder inherits from its parent.