Hi @GGR,
That for, please apply the client script for Sales Invoice.
frappe.ui.form.on('Sales Invoice', {
is_return: function(frm) {
if (frm.doc.is_return === 1) {
frm.set_value('naming_series', 'ACC-SINV-RET-.YYYY.-');
frm.set_value('update_stock', 1);
}
else {
frm.set_value('naming_series', 'ACC-SINV-.YYYY.-');
frm.set_value('update_stock', 0);
}
}
});
Then reload (Ctrl + Shift + R) and check it.
Thank You!