Matching credit/Debit Memos to Invoices vs. PO. Need to understand the Correction Types available an

There are several Correction types listed when you are trying to match through lines.  We do not want to match back to the PO because it has been effecting our accruals.  We have taken a company stand to match to invoice.  I need to understand when and how to use these types. Also if Final close PO's would effect this process even though we are not matching back to the PO.

 Thank you

Jessica

Correction Types

1. Price Correction

2. Quantity Corrections

3. Invoice Line correction

4. Amount Correction