When user delete a memo from your mail file an error message (Error accessing product object property) apear and the memo still in Inbox but with a deletion mark (X).
These error never happens before I use a Lotus Script code in QueryDelete Event of Database Script in some of my notes applications. Mail file also had a script in this event.
If after use these applications I try to delete a document from my mail file this error message apears, but if after I had used my application, I close and re-open my mail file it works fine without any error.