Does the Data Integrity Check in POA show "QTY on PO" errors?

Is it always the same items that have incorrect values?

Had you been using Accpac Plus IC with the PO module?

Do you do combined receipting; creating one receipt against multiple PO's?

What is the version of POA that you are using? This information can be found in the menu bar of POA. For example, I've attached a screenshot from my version of POA - "8.0 (06-Aug-2008)"