Update InventSum record field after inserting the record to InventSum table

Dear,

A new customized field was added to InventSum table called ProductName.

I need to update this field after a new record is inserted to InventSum table.

I tried to update "insert" method exits on InventSum table to inculde this logic. The update does not work all the time ; some time the inserted record does not updated to include ProductName.

Any suggestion please?

Also, would you please provide me with code segment which performs the insertion on the InventSum table , As I understand a record is inserted to InventSum once a recored is inserted to InventTrans.

Thank You,

Maram