I'm not sure I completely understand your question. Navision has both a global posting range as well as definable posting ranges per user. If you don't want to allow posting dates in the future, then just set the "Allow Posting To" field in your G/L setup. However, if you are talking about literally restricting a date of tomorrow and forward for any given day, you would need to update that every day, unless you make a code change. If you wish to make that code/design change, it would not be very hard (though I'm not sure I would advise it).
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I traded my sanity for a railgun