If we received a partial payment even though the calculated construction progress was not yet reached, I delayed the payment but provided an explanation. Normally, this was because the executing subcontractor had reported their work finished even though it was not yet the case. If one paid, the subcontractor would move on to the next construction site instead of continuing their work immediately. If one did not pay, the customer service representative at Heinz von Heiden would put pressure on the craftsman. The completion report, not the approval by site management, was decisive. However, the customer service representative also scolded us heavily if I delayed something.