Example showing how to fetch value in a child table field from Master DocType
Sample Script to fetch expiry_date field from Batch doctype to Sales Invoice Item table
Step 1: Create Custom Script for Sales Invoice (parent) doctype
Step 2: Script as below & Save
frappe.ui.form.on("Sales Invoice Item", "batch_no", function(frm, cdt, cdn) {
var d = locals[cdt][cdn];
frappe.db.get_value("Batch", {"name": d.batch_no}, "expiry_date", function(value) {
d.expiry_date = value.expiry_date;
});
});