Reactivating any process in an "overlimit" state will allow the job to continue.
"Overlimit" occurs when the process appears in the job queue a maximum number of times. There is more about this in the Process Orchestration
As per the guide, this is determined by the Threshold value (disable) property of the process. More about this here: Notification During Process Handling
The script mentioned, SDK_SetLimitationCount_in_Jobchain, is here: SDK\SQLSamples\MSSQL2K.