On Bound Variable Change

Code	Can be called by	Definition
54	Form	The variable bound to a subform is modified

Description

This event is generated in the context of the form method of a subform as soon as a value is assigned to the variable bound with the subform in the parent form (even if the same value is reassigned) and if the subform belongs to the current form page or to page 0.

Form more information, refer to the Managing the bound variable section.