Hi Tanja,
If you are using the most current version of an Adagio program, there may be an option in the Company Profile to 'Validate closed periods' which can either Allow, Warn or Disallow a user from entering a transaction with a date in a Closed GL fiscal period, or a date for which there is no respective GL fiscal period (ie the future).
So you can set what you require and just ensure that those periods are marked as Closed in GL. Note that this setting is for Sub-Ledgers only. Closing a fiscal period will automatically prevent entry in GL batches to that period.
This feature can also be used to prevent the accidental entry of some date in the future.
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Regards,
Softrak Tech Support