Warnings at the top of every page (stale bank data, VAT return overdue)

Two warnings can appear at the top of every page of a client, at most two at a time: stale bank data and an overdue VAT return.
Stale bank data: No bank line since a date on an account: the newest line is a number of days old. It means the newest imported line of that account is old, so the books may be missing money. Choose Open accounts, then import the latest statement.
VAT return overdue: The VAT return for a period was due on a date and is not filed yet. Choose Open tax. The date is unverified: a permanent extension of the filing deadline is not taken into account, so check with the tax advisor. The app does not file anything for you.
A warning goes away by itself once its cause is gone, after the statement is imported or the return is filed.