Hello,
Generally when you set an system action (or other operations) , on a step Action, on the "Then Go To" field , the next sequential step should be referenced in. For example, if post completion of Time Entry step, the process needs to complete, then the field should be set to the step "Finish". If the process still has further actions remaining, then the next logical step should be referenced in this field.
The "Then Go To" field is used for connecting the next available step, to keep the process workflow propagating.
Example:
Hope this helps.
Regards,
Samik