Thanks Kim but upgrading is not an option at the moment. From what I understand the previous developers made some major changes to the core code. In other words no just templates.

So on a related question. When the user fills in the Shipping address form on the checkout step 1 of 3. I'm trying to trace how this POST into the ZC system. Specifally I'm looking at how the address gets written into the address table. It is at that point the entry_zone_id is left as zero.