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Significant Events in the Reporting Period - Schedule of Income Taxes Recognized in Unaudited Condensed consolidated Interim statements of Profit or Loss (Details) - EUR (€) € in Thousands | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Tax on profit/(loss) for the year |  |
Current tax (expense)/income | € (1,287) | € (595)
Current tax, adjustments to prior periods | (221) | 9
Deferred tax, movement for the period | (563) | (475)
Deferred tax, recognition of previously unrecognized deferred tax assets | 679,587 | 0
Total tax on profit/(loss) for the period | € (677,516) | € 1,061

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