4. The method of claim 1 wherein each of the plurality of ECA items is supported by one or more messages exchanged in the computer network system between the two or more entities in the supply chain.
4. The method of claim 1 wherein each of the plurality of ECA items is supported by one or more messages exchanged in the computer network system between the two or more entities in the supply chain. 5. The method of claim 4 wherein each message is formatted in extensible Markup Language (XML).