The case study specifies that:

Salespeople manage opportunities/quotes and release orders to the warehouse.

Warehouse staff fulfill orders and complete shipments.

Office/accounting staff are responsible for invoicing (separation of duties).

Therefore, the correct sequence for processing sales orders is:

Add External Document No. to Sales Order

An office employee enters this reference (often the customer’s PO number) before processing.

This step ensures traceability for auditors and aligns with required documentation.

Warehouse employee performs Post and Ship

The warehouse is responsible for picking, packing, and shipping items.

They must post the shipment in Business Central, creating a posted shipment record.

The warehouse does not invoice, since invoicing is the responsibility of the office.

Office employee performs Post and Invoice only

After confirmation that the order shipped, the office staff posts the invoice.

This matches the new division of duties and provides the financial document to the customer.

Why not the other options?

Warehouse performs Post, Ship, and Invoice: Incorrect because invoicing is not the warehouse’s responsibility.

Warehouse performs Post and Invoice only: Wrong, warehouse does not invoice.

Office employee performs Post, Ship, and Invoice: Wrong, because shipping is handled by warehouse.

Warehouse employee changes Posting Date: Not a standard requirement for fulfilling orders in this case.

Microsoft Learn References

Process Sales Orders

Post Shipments and Invoices Separately