You would need to treat it as a contra-invoice. You may find this useful:
http://community.quickfile.co.uk/t/contra-invoicing-same-customer-and-supplier-netting-off-receivables-and-payables/345/2?u=qfsupport
You would need to treat it as a contra-invoice. You may find this useful:
http://community.quickfile.co.uk/t/contra-invoicing-same-customer-and-supplier-netting-off-receivables-and-payables/345/2?u=qfsupport