var pData = Api.AdkCreateData(Api.ADK_DB_OFFER_HEAD);

            var error = Api.AdkSetSortOrder(pData, Api.ADK_SORT_ORDER.eOfferNr);

            if (error.lRc != Api.ADKE_OK)
            {
                HandleError(error);
            }

            error = Api.AdkSetDouble(pData, Api.ADK_OOI_HEAD_DOCUMENT_NUMBER, orderNumberDbl);

            if (error.lRc != Api.ADKE_OK)
            {
                HandleError(error);
            }

            error = Api.AdkFind2(pData, 0);

            if (error.lRc != Api.ADKE_OK)
            {
                if (error.lRc == Api.ADKE_NOT_FOUND)
                    throw new NotFoundException($"Order or offer with number {orderNumber} was not found");

                HandleError(error);
            }

            var customer = new string(' ', 20);
            error = Api.AdkGetStr(pData, Api.ADK_OOI_HEAD_CUSTOMER_NUMBER, ref customer, 20);

            if (error.lRc != Api.ADKE_OK)
            {
                HandleError(error);
            }

            Console.WriteLine($"Kund: {customer}");

            var nRows = new double();
            error = Api.AdkGetDouble(pData, Api.ADK_OOI_HEAD_NROWS, ref nRows);
            if (error.lRc != Api.ADKE_OK)
            {
                HandleError(error);
            }

            Console.WriteLine($"Antal artiklar: {nRows}");

            var pOrderRows = 0;
            error = Api.AdkGetData(pData, Api.ADK_OOI_HEAD_ROWS, 0, ref pOrderRows);
            if (error.lRc != Api.ADKE_OK)
            {
                HandleError(error);
            }

            for (var i = 0; i < (int) nRows; i++)
            {
                var pTempRow = 0;
                pTempRow = Api.AdkGetDataRow(pOrderRows, i);

                var articleNumber = new string(' ', 20);
                error = Api.AdkGetStr(pTempRow, Api.ADK_OOI_ROW_ARTICLE_NUMBER, ref articleNumber, 20);
                if (error.lRc != Api.ADKE_OK)
                {
                    HandleError(error);
                }

                Console.WriteLine($"Artikelnummer: {articleNumber}");
            }