Hi, Jean,
Setting a 'Warn if entry days away' option will warn you if the JE entry date is 'x' number of days away from the session date that is used when you log into a Ledger.
Currently, there is no way to turn off the warning that the JE entry date being used does not fit into the date range specified for the posting period selected. Perhaps, if you know you will be creating entries for the prior month, you would use an entry date that falls within the posting period.
I've entered your suggestion for R&D though.
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Regards,
Softrak Tech Support