1.
until complete settlement of the accepted balance. On receipt of cheque or draft the fulfilment shall only come into being if the cheque or draft is cashed and we can use the amount without any recourse [...] the basis of cheque-draft-procedure, the retention of title also covers the cashing of the draft issued by us and cashed in by the customer and shall not expire due to crediting of the cheque received. The [...] shall only be considered to be effected if we dispose of the amount (receipt of payment). Draft and cheque will only be accepted after previous agreement and only on account of performance and shall only