The Validation in Invoice is working properly as the Verification total matches with Invoice Total. The issue occurs during refund process as mentioned in my posting. Please inform if you have a solution.

For Refund invoice also, there is verification total which should match with Total.Refer the link: http://awesomescreenshot.com/0f42iqcsee

Thank you very much for the quick response and sharing the screenshot. Looks like you have selected the refund method as draft refund. As you would note from my posting, the issue is seen when you select the refund method as ' Cancel: create refund and reconcile' and hit the create refund button. I would appreciate your response.

I have done the same after Ask Refund -> refund method as ' Cancel: create refund and reconcile' -> add reason -> Create Refund, but din't face any issue. When you click on "Create Refund" , it will create Refund Invoice with the same verification total of the invoice and refund invoice. There may be possible Verification Total of invoice does not match the Total and that is why you encountered the issue. You can check the method "compute_refund" of account/wizard/account_invoice_refund.py. (line:160)

Thank you again for your response. As you would see Verification Total and the Total of invoices match as shown in the screenshot in the link: http://awesomescreenshot.com/0512is662d. I have verified the method 'compute_refund' but did not find any flaw. Any thing else you suggest after seeing the screenshot?

inv_obj.write(cr, uid, [refund.id], {'date_due': date, 'check_total': inv.check_total}) This line add Verification Total in Refund from the Invoice. You need to check technically why you are not getting the correct amount. You can "print inv.check_total" and check.