Hi Eric,

I don't think they work yet.  See Eric Schulte's message to the mailing list on Oct. 27:

Re: [Orgmode] org babel and alternative output file when using +call


All the best,

Tom


On Nov 3, 2010, at 5:03 AM, Eric S Fraga wrote:

Hello,

short question as I seem to have got lost between the mailing list
archives, the Worg documentation and the info files: does passing header
arguments when invoking a babel source code block using call or function
actually work?  it doesn't seem to for me for Ledger blocks (I've been
trying to update the tutorial example) and I wonder whether I have done
something wrong with the ob-ledger code initially...

Thanks,
eric

--
: Eric S Fraga (GnuPG: 0xC89193D8FFFCF67D) in Emacs 23.2.1
: using Org-mode version 7.02trans (release_7.3.10.g7f79.dirty)

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