When recording an invoice, you can match it against an order. This means that the line items from the order can be imported saving you time, having to type them in. Watch the video below to see how Invoice Matching works:
One very important thing to know: Zahara doesn’t do line by line matching – we only do value matching. ie You ordered £2000 of goods and received £1500 – the balance is £500. We don’t take into account where that difference is and on what line. You can GRN an invoice to show received quantities to assist. 
If you find you cannot record a second invoice against an order, with the message saying “it’s fully received” then turn off the feature in 
Business > Settings > Validations