What prerequisite is NOT necessary when using the condition technique for message determination in EDI for purchase orders?

In the context of using the condition technique for message determination in Electronic Data Interchange (EDI) for purchase orders, marking a purchase order as urgent is not a prerequisite for applying the condition technique effectively. The other options highlight necessary conditions that need to be considered for successful message determination in specific scenarios.

When implementing the condition technique, it is crucial to understand the relevance of fields and message types. For instance, the relevance of the Price and Quantity fields ensures that any changes in these areas trigger the appropriate message generation when requirements or purchase order details change. Additionally, having different message types for change print operations allows the system to correctly identify and process variations in communications for modified orders.

The requirement for the New Message Determination Process for Change Messages indicator to be flagged ensures that the system differentiates between original and changed messages, activating the appropriate logic for message determination upon changes to an order.

In contrast, marking a purchase order as urgent does not directly influence the functioning of the condition technique. It may impact priority processing but is not a fundamental requirement within the EDI message determination framework. Thus, this option stands apart as not being necessary in the context described.