Can I post voucher in future accounting period

Hello,

We are on PeopleSoft 9.2. I am trying to troubleshoot a custom process and need to post voucher in different accounting periods. I manually updated the open period to next month. The voucher was initially created in the current period, then unposted to make some changes. At present, I am trying to post the voucher with the open period set to the following month but the system doesn't seem to select the voucher for posting. Is this not allowed in AP ? Any pointer would be helpful.

Thanks,

Debolina