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Revenue (Details) - Schedule of Revenue - EUR (€) | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Revenue recognized over time |  |
Consultancy revenue | € 79,031 | € 131,521

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- References No definition available. + Details
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Namespace Prefix: | brer_
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Period Type: | duration

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- Definition The amount of revenue arising from sources that the entity does not separately disclose in the same statement or note. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration