This message creates an activity that reports things that have been done in response to a directed activity. This message creates a planned activity that will affect physical items. This message creates an activity. An activity can be decomposed into a number of of activites that each represents a pair of input/output elements. This message creates an activity. An activity can be decomposed into a number of of activites that each represents a pair of input/output elements. A created activity that represents a planned engineerign change can be promoted to an engineering change order. This message creates a work order. A work order can work that have been done in response to a work request, or any request for change. This message creates a work request. A work request can be an issue, or any request for change. This message promote an activity from a planned state to an order. This dynamically should be reflected by changes of the affected elements. An activity can be decomposed into a number of of activites that each represents a pair of input/output elements. A created activity that represents a planned engineerign changeis promoted to an engineering change order can keep its history by creating a new activity for the engineering change order.