[Orgmode] $0 replaced with ampersand (&) when invoking `org-edit-special'

[niels giesen]

According to [ (info "(org) Formula syntax for Calc") ], $0
references the current cell. Pressing C-c C-c on the #+TBLFM line
below does indeed work, but C-c ' (`org-edit-special') changes the
$0 reference into a single ampersand (&). Is this a bug?

| Thing  | Amount |
|--------+--------|
| Apples |      2 |
| Pears  |    1.3 |
#+TBLFM: $2=$0;%.2f

Regards,

Niels.

Using: Org-mode version 7.4 (latest from git)

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