S.147: Reassessment — Under invoicing of export invoices -Reassessment notice entirely based on the M. B. Shah Commission report without application of mind – Held to be not valid-Period during which lockdown was in force in country due to COVID 19 pandemic was to be excluded for purpose of computing time set out for pronouncement of judgment by Tribunal i.e. within 90 days from date of hearing . [ S.148, 255 , ITAT R. 34(5) ]