(1) The remuneration is to be paid upon acceptance of the work. If the work is to be accepted in parts and the remuneration for the individual parts is specified, then the remuneration is to be paid for each part upon its acceptance.
(2) The remuneration of the contractor for a work the production of which the customer has promised to a third party is due at the latest
1. to the extent that the customer has received from the third party their remuneration or parts of their remuneration for the production of the promised work,
2. to the extent that the work of the customer has been accepted by the third party or is deemed to have been accepted, or
3. if the contractor has set the customer a reasonable time limit for information on the circumstances referred to in nos. 1 and 2 and this has expired without result.
If the customer has given the third party security on account of possible defects of the work, sentence 1 applies only if the contractor gives the customer an appropriate security.
(3) If the customer may demand remedy of a defect, they may refuse to pay a reasonable portion of the remuneration after this has become due; as a rule, twice the costs necessary to remedy the defect are appropriate.
(4) If the remuneration is assessed in money, the customer is to pay interest on it from the acceptance of the work onwards, except to the extent that remuneration is deferred.