Thanks Kate,

The issue has been resolved. I know we will have to be careful going forward to change the automatically generated credit note number issued to a restored invoice (when restoring it as a credit). Also will remember to not use the sales invoice "history" report expecting it to be an accurate accounting of our sales for the month, since it will only be accurate if we always remember to change the numbers as mentioned above. Will use other reports for that.

Thanks for your help...I really appreciate it!
Karen