How to add Intercompany's ledger Account (LedgerDimension) into Form in AX 2012

I understand how to add ledger Account (LedgerDimension) into Form by article below

https://nasheet.wordpress.com/2012/05/24/how-to-add-ledger-account-ledgerdimension-into-form-in-ax-2012/

However I'd like to know how to add Intercompany's ledger Account (LedgerDimension) into Form in AX 2012.

I have to select Intercompany's ledger Account and dimensions.

Anyone know this?