Implements reversals creation + renames _get_current_period_id to _get_offset_period_id + reviews get offset period id logic with 'find' and complementary 'next' method to obtain the expected result.
Implements reversals creation + renames _get_current_period_id to _get_offset_period_id + reviews get offset period id logic with 'find' and complementary 'next' method to obtain the expected result.

xcgd/account_move_reversal