Unable to post Reverse Transactions

Hello,

I find I am unable to execute a reverse transaction as when clicking on 'Execute' I get the following message: Date deviates from permissible range [Journal Entry - Value Date] [Message 173-11]

The posting date of this journal is 30/06/10. The reverse date is 01/07/10 (which falls within period 1 on the following year)

Upon checking my posting periods for June-10 it reads as follows:

Posting Date from 01.06.10 To 30.06.10

Due Date from 01.06.10 To 30.06.11

Document Date from 01.07.08 To 30.06.11

The period for June reads as follows:

Posting Date from 01.07.10 To 31.07.10

Due Date from 01.07.10 To 30.06.11

Document Date from 01.07.09 To 30.06.11

I can't see anything obvious as to what's wrong? Any help/advice would be a big help.

Regards,

Juan