R12 I can not select the same SLAM for 2 Primary Ledgers

Hello :

I have two primary ledgers one for USA and another for Mexico and we want to share the same SLAM for both ledgers. However so far I can not select it on the Mexico Ledger.

I think the issue is the following :

I think on the SLAM I need to define the "Transaction Chart of Accounts" as NULL

Please Advise

Bug 13516412 : CANNOT SELECT SUBLEDGER ACCOUNTING METHOD

If incase customer has nothing in specific to do with "Transaction Chart of 
Accounts" then they can create all the AMB Components : 
SLAM/AAD/JLD/JLT/ADR/JED with
"Transaction Chart of Accounts" as NULL