I had gone to the local Income tax office today and asked the officer on this issue
His stand was that what the site says about 26AS as the final authority is correct, but comes with a caveat.
All transactions where IT has not been deducted especially in case of interest on savings Bank account and other such small entries then the onus is on the taxpayer to include them in the return.
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He also added that notices have been issued based on the AIS.
Just for info please