Confirmation Statement: Error on Beta submission

My developer colleagues submitted a test Confirmation Statement to the Beta submission URL this morning. In their submission, they used the following dates;

 <DateSigned>2016-07-01</DateSigned>
 <ReviewDate>2016-08-30</ReviewDate>

The response they received contained the following two errors;

<GovTalkErrors>
  <Error>
    <RaisedBy>ConfirmationStatement</RaisedBy>
    <Number>9999</Number>
    <Type>fatal</Type>
    <Text>ReviewDate in the future</Text>
    <Location></Location>
  </Error>
  <Error>
    <RaisedBy>ConfirmationStatement</RaisedBy>
    <Number>9999</Number>
    <Type>fatal</Type>
    <Text>You cannot file a Confirmation statement with a date before 30th June 2016</Text>
    <Location></Location>
  </Error>
</GovTalkErrors>

When my developer colleagues changed the Review Date to todays date, the submission did not prompt errors in the response.

We did not encounter these errors when we posted test submissions using the same dates to the Alpha submission URL.

Can you please explain why we received the errors we did when we used the dates we did?

our config is set to 30/06/2015 so you are able to test, you cannot file in the future and before the config date - can you give it another go please