adding custom nodes in uwq form

Hello Gurus,

Have a requirement like need to show a new node in UWQ of Collection agent responsibility That will list delinquent transaction for bill to customer with some transaction line dff attributes.

Say I create customer query for this purpose, and use it as view as per [ Note ID 1122776.1].

Where should i write code in IEUSEUWQ form (offcourse copy of it) to invoke IEXRCALL form call function on clicking of particular record in grid.

Note able to figure how grid events in IEUSEUWQ and other form invoked.

requesting guidance.