Hi suresh@connectin,
Welcome to Community! It's important that you're able to send data without error so you can accomplish your QuickBooks goals in a timely fashion. I'd be happy to provide some insight here!
Based on the error you've received, I recommend making sure all of your transactions have a sales tax rate. Each line item must have a tax code. If you've changed a tax code for a line item, it results in two line items with the same tax code and they need to be merged into one line.
If you require additional assistance, please don't hesitate to reach out to Intuit Developer Support.
Feel free to reach back out if other questions should arise. We'd love to help!
