How to prevent incomplete and unaccounted invoices from being published on the Supplier Portal?

Summary:

Currently invoices are being published on the Supplier Portal when they are not yet completed.

This causes a lot of questions from the suppliers.

This concerns invoices which are created by the customer themself.

We would like to prevent these invoices from being published on the Supplier Portal untill they are completed or accounted for example.

Is there a way to add a layer of approval or something before the invoices are being published?

We were thinking for a final approval or the accounting of the invoice for example.

Content (required):

Supplier Portal

Version (include the version you are using, if applicable):