In our case, the wooden walls are produced by a German manufacturer who is COC-certified. The wood then is bought by a German wooden walls vendor who is not COC-certified buy he doesn't change the product. The German vendor sells the wood to the polish distributor who is not modifying the product either. The polish distributor is only installing the product onsite. We received the FSC certificate and an invoice from the German manufacturer showing the COC number however the cost of the product is hidden. We don't know what was the cost of the wood when it was sold to the German vendor. We only know the cost provided from the polish distributor. Would it be accepted by GBCI, any thoughts?