I try tables 5.9.5

From the Manual:

<b>The tag “EULA” is nested inside the tag “Documents”: the files contained in “EULA” are (apparently) not tagged with the tag “Documents”. But if you browse the tag “Documents” you’ll also see the files contained in “EULA”.</b>

but :

I created “Documents” and did put some files in it. When I open the tag “Documents” I see at the right side these Files.

Then I created the tag “Eula” in all categories. Then I put some Files in it. Is ok.

Then I move “Eula” into “Documents” (by drag and drop). It is now under “Documents” (father). I can open “Eula” (child) and see these Files.

But I can no more change to the “Documents” (father) and look at its content.

I can change to any other tag in “All categories*, but from there I cannot not go to “Documents” (father). The chosen other tag stays. I can go to “Eula” (child) however and see the “Eulas” Files. I can also chose any other tag, only the “Documents” (father) is impossible.

When I put “Documents” back to all categories it’s again possible to look into “Documents”

What do I wrong?