We can purge invoices, provided following conditions should match:

If you are purging invoices, the Purge program purges related invoice distributions, invoice approvals, and invoice batches. You can purge invoices that meet the following criteria: 

- Last Update Dates of the invoice and its distributions, and the Invoice Date, is less than or equal to the Last Activity Date.

- Invoice is fully paid or is a zero–amount invoice.

- Invoice is fully posted.

- Invoice does not have any 1099 distributions, and is not for a 1099 supplier.

- Invoice was not generated by a recurring invoice template.

- Invoice is not a prepayment, and no prepayments have been applied to the invoice.

- All of the invoice’s payments meet the Payment Purge Criteria.

- No open encumbrances are associated with the invoice.

- Invoice is not Oracle Projects related.

- All purchase orders referencing the invoice meet the Purchase Order Purge Criteria (this condition applies only when you
choose Matched Invoices and POs for the purge category).

- If Oracle Assets is installed, all of the invoice’s distributions were tested by Mass Additions.