Compliance request: block or warn on closing bills that contain only payments (Spain / SII)

The issue
Mews currently lets users close a bill that contains only a payment line. Under Spanish invoicing regulations (Real Decreto 1619/2012, art. 6), every invoice must include a description of the operation, the taxable base, the VAT rate and the VAT amount. These payment-only documents meet none of those requirements, so:
- SII rejects them.
- They cannot be fixed in Business Central, because the lines and descriptions cannot be edited once posted.
- Each one must be corrected with a credit note and, where applicable, a new invoice, within the SII reporting deadline (4 working days). Late or incorrect SII reporting can lead to penalties for the property.

This is not a user-preference request. It is a compliance issue for Spanish properties.

What we are asking for
1. A setting to block closing a bill when it contains no revenue items (only payments), at least for properties in Spain; or
2. If a hard block is not possible, a mandatory warning or confirmation when a user tries to close such a bill.

Thank you!