Product Cost Display

Hi,
I have Product Cost Display module working on normal products.

When I enter a cost price amount, for a Document-Product type however, it writes to the database, but is not showing when I go back to edit the product.
So can view the cost amount in phpmyadmin, but not in zen admin.

It works for normal products, apart from the fact it displays the decimal point in the wrong place. eg 10.00 shows as 1000.00 in admin.

Any idea what a fix might be? I assume the module is designed for only the normal product type, but hope it can be altered for other types?

That is because it affects only product.php and not document_product.php in the admin

Probably not an easy change, to make it work for document_product I'd assume?

I think you are correct
update_product.php is used/replaced by the mod
I do not see a comparable for product_document