"* invoice no.","cluster","* unit no.","* item code","* bill date","* bill due","* amount","outstanding","remarks"
"INV 000001","BLOCK-A","UNIT-1","ITEM-1","20/12/2011","20/12/2011",90.05,10.00,"Bill for Item 1"
"INV 000001","BLOCK-A","UNIT-1","ITEM-2","20/12/2011","20/12/2011",20.00,10.00,"Bill for Item 2"
"INV 000002","BLOCK-B","UNIT-2","ITEM-1","20/12/2011","20/12/2011",50.50,10.00,"Bill for Item 1"