Multiple payments with the same bill of exchange

Hi,

Basically my issue is how to do a payment for multiple customer invoices with the same bill of exchange, for example:

Bill of exchange n° (1) : 1 000 000 $

22/01/2014: First paymentCustomer A.A – Customer Invoice n° (1) – Amount : 50 000 $ – Bill of exchange n° (1) .

24/01/2014: Second paymentCustomer A.A – Customer Invoice n° (2) – Amount : 50 000 $ – Bill of exchange n° (1) .

Any help?

Regards,

Sara.