Fetch value in a child table field from Master

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;
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