Error returned from HMRC
| Cause | Symptom | Solution |
|---|---|---|
| HMRC only allows one period to be submitted for a given test user. | Invalid Period message is returned. | Change the period in the XML and retry. If you have run out of periods then create a new test user. |
Note: You may have similar messages to the one described above, such as CLIENT_OR_AGENT_NOT
_AUTHORISED. Refer to the log files for further details.