In Appian, what condition must be satisfied for a parent process to receive updates from a sub-process?

For a parent process to receive updates from a sub-process in Appian, both processes must be published. Publishing a process makes it available for execution and allows for proper interaction between processes. If a process is not published, it cannot be invoked or interact with other processes, which means the parent would not be able to receive any updates from the sub-process.

The requirement for both processes to be published is fundamental to ensure that communication, data passing, or any updates can occur as designed. This reflects the dependency on the proper deployment of process models, facilitating the expected behavior in Appian's workflow management.

The other conditions do not directly impact the ability of the parent process to receive updates from the sub-process. While marking a variable as needed may control data flow or updates in terms of data structure, it does not influence the basic requirement of publishing. Likewise, it is not necessary for the parent process to initiate the sub-process specifically to receive updates, as updates can be sent after the sub-process runs independently. Lastly, the completion of the sub-process does not affect whether the parent can receive updates during its execution. Thus, the best answer that accurately describes the condition for receiving updates is that both processes must be published.