It's my fist message to the list so I hope I'm not missing anything.
In section 10.4 "Commands in the agenda buffer" the View/Go to Org file
commands are described as:
@tsubheading{View/Go to Org file}
@item mouse-3
@itemx @key{SPC}
Display the original location of the item in another window.
With prefix arg, make sure that the entire entry is made visible in the
outline, not only the heading.
@c
@itemx @key{TAB}
Go to the original location of the item in another window. Under Emacs
22, @kbd{mouse-1} will also work for this.
@c
@itemx @key{RET}
Go to the original location of the item and delete other windows.
@c
According to the Texinfo documentation:
https://www.gnu.org/software/texinfo/manual/texinfo/html_node/_0040itemx.html
It seems like:
@itemx @key{TAB}
and
@itemx @key{RET}
are not subsequent entries of @item mouse-3 but entries on their own.
They should be coded as @item.
Jean-Christophe Helary