Simple Invoices - Forum

First off I'm aware that the manage pages are being redeveloped, but i think i'd have to redo essentially the same thing once its redone anyway, and this would be a good practice, so...

Our place when i showed them a test version of this liked the idea, but wanted some way of writing the projects status - Ie send bill off, wait a bit almost done, something that you can type yourself. So, a custom field sounded perfect for it.

So, the first custom invoice field is referred to as:
[b]invoice_cf1[/b] According to the simple invoices menu. Cool!

Now, to add this to be displayed in the manage invoices menu is what I'm after. I tracked the page I think to be manage.tpl, in templates/invoices .

The code I think I need to change is this

.... beginning of thread
{[i]$LANG.customer_cf1[/i]}
... end of thread

Actual column data:

{$invoice.customer_cf1.name}

Result is I get a blank sortable "tab", and a blank area for the actual content.

This is far as i think I can get with the code. The goal is to display the information for that custom field - am I writing the variable that refers the customer_cf1 wrong?