I am not able to generate e-invoices in BUSY. What should I check to enable e-invoice generation?

If you want to configure for automatic generation of E-way bill & E-invoice from BUSY, you can follow these steps:
 Step 1: First you have to create a GSP (GST Suvidha Provider), you need to visit the eway bill or e invoice portal and select Webtel Electrosoft Private Limited and Pinnacle Finserv Advisors Private Limited as the GSP Vendor type.
 Step 2: Go to Administration and click on configuration.
 Step 3: Select Features / Options and click on GST / VAT, here you will see a option called E-Way Bill / E-Invoice Required.
 Step 4: Set Y to turn it on and mention your place and pincode and GSP username and password in GSP Configuration tab and save the configuration.
 Step 5: Go back to Administration and click on configuration.
 Step 6: Choose the Voucher Series Configuration option and select the voucher type for which you want to generate eway bill and e invoice, such as sale, purchase, etc. Then, select the voucher series and click on Voucher Configuration.
 Step 7: Here, you will see options of Input Transport Details, Generate E-Way Bill / E-Invoice After Saving , set Y to enable that. Now your BUSY is ready to generate E-Invoice & E-Way Bill Automatically.