[ic] how to use using item-modifier ?

[interchange-users@icdevgroup.org (Michel COMBE)]

I want to have a fill_status flag on each ordered line.
I tried to use item-modifier without great success.
Here is what I did :

Add the following line at the end of catalog.cfg
UseModifier fill_status

Try setting the flag inside the flypage (the page from which I want all
orders to be done)
[if ...]
[seti fill_status]FILLED[/seti]
[else]
[seti fill_status]EMPTY[/seti]
[/else]
[/if]
I have the feeling the seti is wrong but I don't know which instruction to
use.

Finaly I modified the cart component adding the following to display the
status
<td>[item-modifier fill_status]</td>

Well, It doesn't work... I would appreciate if someone could help.

Regard
Michel COMBE