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Revenue - Contract assets and liabilities (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenue      
Beginning of financial year € 3,157 € 16,156 € 8,810
Acquisition of businesses 1,913    
Deferred during the year 10,670 2,857 9,097
Recognised as revenue during the year (1,859) (15,856) (1,751)
Total liabilities at end of period € 13,881 € 3,157 € 16,156