HOWTO: Merge ledger and financial dimensions using X++ code

To merge two or more financial dimensions use this script.

DimensionDefaultingService::serviceCreateLedgerDimension(ledgerDimension,customerDefaultDimension);

You can merge more  than 2 dimension, infact you case specify some default dimensions to merge

More details and a real case implemetation detail on: http://community.dynamics.com/ax/b/dynamicsaxconcoction/archive/2014/07/25/ax-2012-merge-ledger-and-financial-dimensions-using-x-code.aspx