A new Code Wizard template for Siemens mill controls was added to the factory software at Edgecam 2010 R1. This is an excellent template to start with if you are constructing a new post. Many of the posts built prior to 2010 R1 version were based on the ISO template and required major work to correct. So, check any posts that you get to see if they are based on the ISO or newer Siemens template. You can do that easily by opening the post in Edgecam's Code Wizard and choosing Properties from the Help menu.
I've built a post for a 5 axis mill with a Siemens 840D control using the new Siemens template, and very pleased with the abilities in the Code Wizard. You can contact me if you are interested in purchasing the post.
You may also consider contacting your reseller?