Missing e-invoice generation option in BUSY. How to enable?

The E-Invoice option is available in the Standard or Enterprise models but is not available in the Basic model. 
 If you have a Standard or Enterprise model and want to enable E-Invoice, follow these steps:
 Step 1: Go to Administration, then select Configuration, and click on Features & Options.Click on GST/VAT, and set 'E-Invoice Bill Required' to Y.
 Step 2: Configure the E-Invoice settings by entering your Place and Pincode. Then Go to GSP Configuration and select 'Automatically.'
 Step 3: Generate a GSP User ID and Password. Open your Eway Bill Portal in any browser, log in with your ID.In the menu, click on Registration, and then For GSP.
 Step 4: Click Send OTP, and enter the OTP received on your registered phone number or email.
 Step 5: Click Add/New and select User as Webtel Electrosoft Private Limited. Enter any 3 characters, generate a password, and save the ID.
 Step 6: Generate another GSP ID for Pinnacle Finserv Advisors Private Limited.
 Step 7: Copy your Webtel User ID and enter it in GSP Configuration in BUSY, along with the password generated on the portal. Click Validate.
 Step 8: Copy your Pinnacle User ID and enter it in GSP Configuration in BUSY, along with the password generated on the portal. Click Validate and save the page.
 Step 9: Go to Administration, select Configuration, and click on Voucher Series Configuration.
 Step 10: Choose the voucher type and click on Series,then Voucher Configuration.
 Step 11: Enable Input Transport Details by pressing Y. This will generate E-invoices after saving.