There is a feature in Dynamics 365 Finance & Operations for Expense report posting, which helps you to post the expense report in the next opening period if the current period is closed.
To enable this, you need to go to Expense mangement -> Setup -> General -> Expense management parameters form -> Financial tab, and tick the checkbox with label “Correct accounting date during posting”.
Note that this feature would only work if the period you are trying to post in is in the fiscal year, that is not more than 2 years prior to the current fiscal year. If the accounting date is in the fiscal year which is more than 2 years old, then this feature won’t work as there is a limitation in the framework in regards to this.
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