Mendelsohnf

I hope someone can help with our conundrum. We have a client based in the UAE who paid us for a product that a factory in Germany has produced for us on the client's behalf. The client paid us more than what it cost the factory to produce. This excess is our commission. The factory in Germany will ship the goods to the UAE. The problem is that the commercial invoice from Germany will not match what the client paid. My question is, can we produce a commercial invoice in the UK for goods that are in Germany and due to be shipped from there to the UAE? Can we forward this on to the client and the factory to use instead of the factory's commercial invoice?