Cannot post in posting period even though the posting period is open

Hello all,

Our fiscal twelvemonth runs from April to March, which means that that play 1 is successful April and that we are presently successful play 4 (July). The play is open:

In Manage Posting Periods everything is unfastened arsenic good from 01-2024 until 12-2024, but accommodation periods which are inactive successful 2023.

However, erstwhile I effort to station a supplier invoice, I get the beneath error:

What is causing this mistake and wherefore can't I station the supplier invoice?

Kind regards,

Floyd