Reset Instance
When an error occurs during the processing of a Workflow model instance, the Workflow engine either takes the explicit error condition transition path or it executes the Error Handler activity, if one exists. When this happens, the instance successfully exits the model even though an error occurred. This way, the user can attach the Workflow model instance and select the "Reset Instance" Tool menu option.
When resetting the instance, the Workflow model instance record is reset to "P" (Process Immediately), the next date is set to the current date/time, and the Workflow histories for the Workflow activity and the Error Handler activity are deleted. When the Workflow engine wakes up the next time, the instance is reprocessed.
Note that if the original cause of the error is not resolved, resetting the instance record will have no impact since the same error will likely occur again.