7.4. In case the Buyer has violated the terms of payment, the Buyer pays to the Seller the penalty in the amount of 0.5% of the outstanding amount for each full calendar week of delay or pro rata for each day during the first 4 weeks and at a rate of 0.75% - for each subsequent full calendar week or pro rata for each day of delay, but not more than 5% of the relevant Attachment (Specification).