You can set a Remote Debug preference to check for an out of sync process definition. This means that Process Developer checks that your local copy of the process matches the server copy when connecting to the server.
During remote debugging, Process Developer uses your workspace copy of the process and the actual instance data from the server to perform debugging. The workspace copy of the process should be identical to what is running on the server.
However, if the process definitions do not match, you can perform remote debugging anyway, and Process Developer does its best to step through the activities.
With the preference enabled, if the server copy and the local copy of your process are out of sync, Process Developer give you an option to choose another process, cancel, or continue to starting remote debugging, as the illustration shows.
You can ignore the warning and continue to debug or select another process definition.
If you disable the out of sync option, remote debugging begins, but an error messages is displayed when the mismatch is reached.