As per AS 21, Consolidated Financial Statements,
> Consolidated financial statements should be prepared using uniform accounting policies for like transactions and other events in similar circumstances. If it is not practicable to use uniform accounting policies in preparing the consolidated financial statements, that fact should be disclosed together with the proportions of the items in the consolidated financial statements to which the different accountingpolicies have been applied. (Para 20).
> If a member of the group uses accounting policies other than those adopted in the consolidated financial statements for like transactions and events in similar circumstances, appropriate adjustments are made to its financial statements when they are used in preparing the consolidated
financial statements (Para 21)
Hope it is useful.
Thanks.