What does 'linking bank account' mean for UPI Lite ?
'Linking bank account' here means that you are specifying which bank account needs to be used to add funds to UPI Lite balance. Once activated, you will be able to recharge UPI Lite balance only via the same bank account which was chosen during activation.
To recharge balance using another account, you'll have to deactivate the current UPI Lite account and choose the other bank account during UPI Lite activation.