Autofilling of GST rates in POS

Hi,
The auto updation of auto GST rates was configured as per https://frappe.io/kb/accounting/setting-up-gst-for-multiple-branches

In POS, when an individual customer or customer without GSTIN no. is selected, the GST rates are not calculated in the Invoice. How to resolve this issue?

Seek help!
Thanks
Deepak