6 . All goods must be returned in original condition : repairs , renovations or other modifications applied by the client or third parties to the goods are expressly prohibited without consent of AED , and every potential damage and / or costs resulting therefrom will be recovered from the client .
7 . Late return of the rented goods is at all times charged to the client and increased with the costs resulting therefrom .
8 . If AED cannot meet its delivery obligations , for whatever reason , AED will inform the client thereof as soon as practically possible and will suggest potential alternatives . If these alternatives are not accepted by the client , the client will only have the right to terminate the agreement without incurring any further charges . Any further liability or compensation from AED is excluded .
9 . Without prejudice to any other provision of the general terms and conditions or the provisions mentioned in this price list , AED is only liable for the damage caused by its breach of contract ( including grave fault ) or tort that is directly suffered by the client , and does not exceed an amount equal to the price paid by the client for the goods or services ( including rental ) that gave rise to the damage . Any other liability of AED is expressly excluded , including among others indirect or special damage , damage for loss of profits , loss of contracts , goodwill or reputation , damage to or corruption of data , or any other type of lucrum cessans or consequential damage of any kind , in each case howsoever arising and whether arising in or caused by breach of contract ( including grave fault ) or tort .
10 . All invoices are payable in cash or bank transfer in advance , unless a specific payment term has been agreed to by AED in writing .
11 . Complaints or disputes must be notified to AED in writing by registered letter within 7 business days following the invoice date in order to be considered . Any dispute by the client of any invoice or any part thereof , for any reason whatsoever , does not entitle the client to withhold payment of the due invoices , not even in part .