How to use Same Invoice Order Number

Once installed, all new invoices, shipments and credit memos will be automatically assigned the same number as the related order. For example, for order #1000, the associated invoice would be #1000, the shipment #1000, and the credit memo also #1000.

If there are multiple invoices, shipments and/or credit memos associated with the same order, duplicate separation will happen automatically. For example, the first invoice would be #1000, the second #1000-1, the third #1000-2, and so on.