What occurs when referencing a sub flow from a parent flow?

When a sub flow is referenced from a parent flow, the processing occurs synchronously. This means that when the parent flow executes a call to the sub flow, it will wait for the sub flow to complete its processing before continuing with the subsequent steps in the parent flow. The synchronous behavior ensures that any data or context generated by the sub flow is available to the parent flow after it has executed.

This sequencing allows for streamlined data handling and ensures that the parent flow can depend on the results of the sub flow, which is essential for maintaining the integrity of the processing logic. In scenarios where the order of operations is crucial, such as when certain data transformations must be completed before further actions are taken, synchronous processing is the appropriate approach.

In contrast, options referring to parallel processing or halting may suggest scenarios that do not accurately represent how sub flows operate within parent flows. Discarding messages implies a failure to process, which is not the inherent nature of sub flow referencing. Thus, the synchronous nature of sub flow invocation allows for a predictable flow of execution and data handling between the parent and the sub flow.