English translation: provision of all work and services required
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Explanation: Leistung here is used in the widest sense, i.e. any actions required to be carried out by the client/customer(Auftraggeber) under the contract. This could include the provision of specifications, drawings etc by the customer or advance payments for example.
I think "timely performance by the client/customer" should cover this.
Beate Lutzebaeck New Zealand Local time: 08:54 Native speaker of: German, English PRO pts in pair: 2079