I would seriously question the rationale behind this requirement.
When you have delivery-related billing and use transportation module, you create fiscal invoices after shipment completion (in certain process scenarios this is even done just before shipment end). This means the products were loaded on the truck, the truck was checked at the gate and left your premises, the driver visited the customer and delivered some products.
Invoice cancellation is usually done, when there is an issue with posting the document - for example the account assignment group was incorrect and no G/L account was determined. This means that if you want to remove the delivery from the shipment, you will need to reverse all shipment statuses, take the delivery out and set the statuses again. This will result in incorrect dates and times reported, in addition to that you will have wrong information how much exactly you need to pay to your forwarding agent.
Not to mention that in DSD for example status reversals are very tricky after a certain processing stage. If you have some localization specifics in place, it can be next to impossible or even illegal, because you have already sent additional information to a government portal referring to your shipment and you have received an official invoice number.
In such cases companies prefer to issue proformas before the official invoices, and, if official invoice cancellation is allowed, nobody removes documents from shipments - you either cancel the invoice and create a new one, or create credit/debit memos, or if no products were delivered and invoiced, you add return items, create a return delivery, post GR and reject the order. In all cases you make sure to provide the correct documents to the customer or get back the incorrect official invoices (in some countries this is a legal requirement).
If I were you, I would investigate why the business needs to cancel invoices, which are in a shipment.
In a well-designed process and if people follow the internal procedures, invoice cancellations should be a very rare exception.
Some companies even measure DIOTAI (delivered on time in full accurately invoiced) as KPI. By reversing all these documents you are going to hurt many people.
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