How to get sum from remote table + how to put in bold?

[Fabrice Niessen <www-TA4HMoP+1wHOsUy4gIHrmg@public.gmane.org>]

Hello,

I'm trying to build a template for invoices written in Org... exporting
to PDF (and HTML). Will be officially public as soon as it's DONE.

Though, I have 2 problems currently:

- I'd like to sum up, in table `total', the sub-total column of table
  `items'. But the `remote' call does not seem to accept the `vsum'
  expression. Is this a foreseen limitation?  Is there a workaround to this?

- I'd like to get the computed amount (last line of `total' table) in bold (and,
  if possible, even in a bigger font). How is that doable?

ECM:

--8<---------------cut here---------------start------------->8---
#+TITLE:     Invoice #001
#+OPTIONS:   H:2 num:nil toc:nil

#+LaTeX_CLASS: article
#+LaTeX_CLASS_OPTIONS: [a4paper,table]
#+LaTeX_HEADER: \usepackage{tabu}
#+LaTeX_HEADER: \taburulecolor{gray}

* Items

#+name: items
#+ATTR_LaTeX: :environment tabu :align lXlrlrrl
|              | <35>                                |       |      |     |          |           |   |
| Title of job | Description                         | Type  | Rate |     | Quantity | Sub-total |   |
|--------------+-------------------------------------+-------+------+-----+----------+-----------+---|
| Consultancy  | Quote template                      | Timed |  400 | \EUR/d |      6.5 |   2600.00 | \EUR |
|--------------+-------------------------------------+-------+------+-----+----------+-----------+---|
| Research     | Billing invoice template            | Timed |  400 | \EUR/d |     10.0 |   4000.00 | \EUR |
#+TBLFM: $7=$6*400;%.2f

* Amount Due

#+name: total
#+latex: \hfill\colorbox{yellow}{\begin{minipage}{7.5cm}
#+ATTR_LaTeX: :environment tabu :align Xrl
| /Sub-total/  | 0.00 | \EUR |
|------------+------+---|
| /Tax @ 21%/  | 0.00 | \EUR |
|------------+------+---|
| *Amount Due* | 0.00 | *\EUR* |
#+TBLFM: @1$2=remote(items,vsum(@3$7..@4$7);%.2f::@2$2=@1*0.21;%.2f::@3$2=vsum(@1..@-1);%.2f

#+latex: \end{minipage}}
--8<---------------cut here---------------end--------------->8---

Any hint for me?

Best regards,
Fabrice

-- 
Fabrice Niessen
Leuven, Belgium
http://www.pirilampo.org/