Which requirement aligns with the state diagram for an order management system?

The chosen requirement is correct as it accurately reflects the relationship between the issuance of an invoice and the dispatching of products within the order management system. A state diagram describes various states of a process and the transitions between those states based on certain conditions or events. In this context, the state diagram would likely illustrate that an invoice can only enter a 'issued' state following the condition that products have transitioned to a 'dispatched' state.

This requirement emphasizes the logical sequence of events: a critical business rule that aligns with the operational flow of the order management system. It establishes that an invoice is contingent upon the actual dispatch of products, ensuring that billing occurs only after shipment has been confirmed. This is essential for maintaining accuracy in invoicing and compliance with accounting standards, as it reflects a true representation of completed transactions.

The other options present scenarios that do not directly align with the strict sequencing implied by the state diagram. For example, stating that every order results in at least one invoice could be valid in specific contexts but does not encapsulate a process flow dictated by the state of dispatching. Similarly, addressing product stock issues or delivery exceptions introduce elements but do not capture the core relationship between dispatching products and issuing invoices as clearly as the correct answer does