Rectification u/s 154 in case of non resident

A non-resident individual mistakenly declared themselves as a resident in their tax return, claiming Double Taxation Avoidance Agreement (DTAA) benefits for foreign income. Upon realising this error, which reduced their total income, they sought to rectify the return. However, the tax department is refusing to allow the upload of the rectified return because it results in a lower taxable income. This discussion seeks solutions for this specific rectification issue for Assessment Year 2020-21.