I've seen that in the Type and Attribute manager for attributes that are part of the type definition. This is not an attribute but rather a link to another object that is displayed like an attribute. With JCA, I just had to add another describeProperty tag and it showed up. With Layouts, I didn't see how I could add this type of reference. It's not a physical attribute, but a logical one. That is why I also tried using LogicalAttributes.xml to define it, but that didn't seem to let me add it to the layout either.
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