Updating ap_invoices_all table

 We issue about 5000 refunds each year and in order for the customer to understand why they are getting the refund, we attach a letter that shows the original invoice, refund reason.

 All we would like to do is update the description in the ap_invoices_all table for refunds only to include this information. Is this something our organization would be able to do without any concerns - or are we breaking any rules (i.e. SOX complainance, support agreements, etc)