Integrate Shopping Cart With Navision

There is no hard wired or technical limitation for accessing NAV data, but there is a licensing restriction.

The key piece of information that is required is whether or not the user accessing the information is internal or external to the company. If it is an external user (say a customer or vendor) of the company than there is an "External Connector" single license granule that is required. This is a 1 flat rate for 1 to N users to access NAV data throug sql or some other back end process.

Alternatively if it is your companies internal resources who will require access to this data then there are other licensing models that apply such as self service or DCO licensing that is required.

Typically if your integration only requires to read information from NAV then you can execute direct SQL reads against the database - however it is very very dangerous to write directly to the NAV managed SQL tables and you should have an integration layer that either uses the new service tier or an older NAS based integration layer. Also note that if you want this customization to achieve "Certified for NAV" status then you will need to ensure that you are writing to NAV through the service tier at the very least (if you're reading directly from the SQL database you may have to jump through additional hoops for certification).

One other thing that may or may not apply to you (as you're on NAV 5.x) is some of the employee self servcie licensing that has a lower cost than DCO licenses. This is designed for internal users who are entering time, expenses or other self service type information and is definately available for customers running NAV 2009, but I'm not sure if it applys to NAV 5 as well...you should check with Microsoft of your Partner.