Right of Retention
Refusing your own performance until the other side performs.
If you have a due claim against the other party arising from the same relationship, you may withhold your own performance until they perform, for example a portion of the payment until a defect is remedied. This is a means of pressure, not a permanent right to keep.
The relevant statutes
§ 273 BGB
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Related terms
General explanation for self-help, not legal advice (RDG). Individual cases may differ: if in doubt, contact a consumer advice center or a lawyer.