What should I do if there are differences between the GST return and my books of accounts?How do I file the downloaded GST return on the portal?

Here are few steps you can follow to fix it, if there are differences between the GST return and my books of accounts:
 Step 1: Go to House Keeping and click on Update Voucher GST summary and run this process after backup.
 Step 2: Go to Display then click on GST reports and then click on GST Audit Reports.
 Step 3: Click on Reconcile Account and GST report and select it for Sales and it will show the mismatch entries between the books of account sales and gst sales.
 Step 4: Then look for mismatch in the taxable amounts, discounts, or freight related amount.
 Step 5: Further if still does not match with above process then you have to check the sales register in short date range and compare it with the GST returns.
 Step 6: After checking in short range you have to check and rectify entries.
 You can below steps to file gstr 1 e return directly from BUSY :
 Step 1: Go to Administration and then click on configuration.
 Step 2: Under Configuration Tab, Click on GST/VAT and specify the GST portal Username in given field.
 Step 3: Login your GST portal and go to view profile and enable manage API Access for 30 days confirm.
 Step 4: Then go to Display click on GST report and then GST returns.
 Step 5: Click on GSTR 1 e return option then it will ask for report to be generated so click on DIrect Upload
 Step 6: Further select the return filing period and then check transactional errors and then click on proceed with direct upload.
 Step 7: Then it will told to generate OTP and you will receive an OTP on your registered mobile number.
 Step 8: Enter OTP then your data will get uploaded automatically. Further can check on gst portal.