| EUR thousand | 2019 | 2018 | |
| Purchases of materials and services | 27,938 | 23,896 | |
| Change in inventories | -1,612 | -2,031 | |
| Warranties | -153 | -66 | |
| External services | 825 | 829 | |
| Total | 26,998 | 22,628 | |
| EUR thousand | 2019 | 2018 | |
| Purchases of materials and services | 27,938 | 23,896 | |
| Change in inventories | -1,612 | -2,031 | |
| Warranties | -153 | -66 | |
| External services | 825 | 829 | |
| Total | 26,998 | 22,628 | |