frappe.ui.form.on('Sales Invoice', {
refresh(frm) {
if (frm.doc.company == 'JR ASSOCIATES') {
cur_frm.set_value("letter_head","JRA");
} else if (frm.doc.company == 'Elite Management Services') {
cur_frm.set_value("letter_head","Elite");
}
}
});
The above does not work?