Coupons in Drupal 4.7 e-commerce v3.x

We would simply like to be able to make reusable discount coupons in Drupal EC, Drupal 4.7, EC 3.x. At present this doesn't work and the patch described below also doesn't work for us, although we might have a database problem here.

Please don't tell us to upgrade as firstly coupons don't work in later version of Drupal or EC, second making a system that isn't backwards compatible is not a sensible software architecture decision and should be discouraged.

Thanks

Simon

See our notes below.

I am using drupal 4.7, with ecommerce 4.7 and a re-supplied coupon module
from september '07 (from here: http://veneodevelopment.com/drupal/coupon.zip
)

I can't get this to work.

The simple 'create single use
couponshttp://www.metamute.org/en/admin/store/coupon/create'
function works well, (apart from when on the coupon overview page I click on
'cancel' next to an earlier created coupon, I get an 'authorization
required'-page although I am logged in as admin, so I cannot cancel the
coupon)

but when I try to use the function 'create discount
codehttp://www.metamute.org/en/admin/store/coupon/create_discount_code'
(in order to create reusable coupons), I am having the following trouble:

• I enter 'Name of Discount Code:'
• I enter the 'Value of Discount Code:'

Next to the the field 'Only apply to specific product:', it says: 'Leave it
blank to apply to all nodes.', so when I do and click 'Create Discount
Code', the site brings me back to the coupon overview page, but doesn't
create the coupon as far as I can see.

When I try to enter some NID into this field though, numeric value like
'11631', I see a popup window with the following error message:

'An HTTP error 403 occured. .../store/coupon/admin/autocomplete

When I click on Create Discount Code' nonetheless, I get an error message
saying 'Node must be a name of a product'.

In total, I am unable to create a reusable coupon.

END