Report/Process Issue

Question

Getting close to finishing this project but ran into a new issue. When the user performs a search, a report (non-interactive) is generated and displays a Cart icon if the item is In; this is also a link to add the item to your cart for ordering. The link takes the user to the Cart page, and makes a Request for the ADDCART process, which is an conditional On Demand process loading before the header to fire an Application Process ADDTOCART, based on two values set in the same link.
However, the process isn't running at all. The instructions in the ADDTOCART process are used on another page, so we know the commands are correct, but the tables aren't updated. Here's the link from the report field:
SELECT Case CODATA_INDEX.STATUS
   WHEN 'In' then '<a_href="f?p=&APP_ID.:11:&SESSION.:ADDCART:::P5_ITEM,P5_TAX:'||ITEMCODE||','||TAXID||'">
    <img src="#APP_IMAGES#order_i.gif"></a>'
   ELSE Null
END as "CART", ...The link takes the user to Page 11 correctly, but there's no indication it has even attempted to execute the ADDCART process. The P5 variables are set as directed, but strangely the process doesn't appear to be called. Any suggestions?
(Note: We're running ApEx 4.0 on IE)

Answer 1

I ran Debug on the link but didn't see anything that stood out. Also, I'm not sure how to create a button within the Report (I found myself wishing I could do that when making the original report!), but I'm open to suggestions...
Meanwhile, I've got a recreation of the problem set up on apex.oracle.com
Workspace: CPATE
Username: TESTER
Pass: testing
On the Page 2, you'll see the report with the cart icon described in the original post. Clicking on the links next to it takes you to Page 3, the Details page, and from there you can add an item to the cart.
However, when you click the cart icon on Page 2, it goes to page 4 and assigns the values as directed, but doesn't execute the ADDCART page process (which should be executing the ADDTOCART application process).