Note before posting - open documents exist for transfer to Asset Accounting
(available from V7.8.2336)

When you start a posting procedure from the "Assets" module, the program automatically checks if there are any open vouchers left. If the program finds vouchers with a matching posting date that have not yet been transferred, you will receive a short information message. This is to prevent you from mistakenly forgetting vouchers for transfer from Accounting to Asset Accounting.

This new message appears in the software under "Assets => Posting => fiscal/...".
You can see the open vouchers in the administration under "Edit => Show open vouchers".