I keep getting the following error messages:

In Order Entry, Print Invoice/Credit Note Audit List when doing the day end processing:
Cannot open file"P:\DATA\ARTEL\OEYR0018.PRD". The process cannot access the file because it is being used by another process.

In Inventory, Printing Item Valuation report, it stopped due to the similar message again:
Cannot open file"P:\DATA\ARTEL\ICKC0002.PRD". The process cannot access the file because it is being used by another process.

We have never had this problem before. Turn out, I can't finish the month-end today. Can anyone help? What process is using those files?

Thanks a lot!

Mavis