Usually I use the Handler method when I want to update field value depending on another field value when it changes.
columns: ["Amount", "PaymentAmount"],
The function "Calculate" will be triggered when columns "Amount" or "PaymentAmount" are changed.
My question is, how can I trigger a function when a change uccur on a detail, for example in the Products Details.
How can I activate the "Calculate" function when a change was made in the detail, for example, in the quantity of products?