Hi
As you are using same controlling area so your FY and COA are same for all CCodes..Now you have defined Indian company (example) as HO company so your FYV is V for all CCodes that is in US and AUS but obviously LL is under CCode level. Now you have posted any transaction in US CCode having a NLL it will post LL of US (V3) and also in NLL(K4) ..so it is not cross CCodes transaction just a parallel posting under same CCodes in main ledger and parallel ledger considering differeny FYV
I think your question is answered
Kamal