How to identify system generated invoice

Hi,

1. I  have created the invoice with tax and system was generated two invoices after validation of invoice. one standard invoice against to TDS Authority and other credit memo against to vendor.

2. Due to some reasons credit memo flown with other invoice(old standard invoice against to same vendor) instead of original invoice.

3. After that, Manually cancelled the standard invoice against to TDS Authority which is gernated at Point 1and also cancelled the standard invoice against to vendor which is generated at Point 1. Now system was generated the one standard entry against to vendor with invoice number start with CAN...