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https://nishantrana.me/2020/10/13/fixed-column-names-in-each-table-must-be-unique-column-name-x-in-table-y-is-specified-more-than-once-while-importing-solution-in-dynamics-365/
Fixed – Column names in each table must be unique. Column name ‘x’ in table ‘y’ is specified more than once while importing solution in Dynamics 365