I pay my supplier after I sell one of their products.
I create an exspense, by adding the item to the expense invoice. I edit the description field on the item in the exspense invoice to include information about the exspense.
Upon each supplier payment the supplier would like a breakdown of their payment, but they would like more information then just seeing the "item" description. They would like to see the edited description field which shows more about the exspense