SLA setup for application = cost management

Hello,We are on R12.1.3.

We use SLA feature and SLA rules extensively to meet client's accounting requirements.

Now, we are into new roll out where we have new Ledger with new COA structure.  Due to this, we need to create new subledger accounting method (SLAM).

For this new SLAM, we want to use same journal line definition (JLD) and same account derivation rule (ADR), that were used in earlier releases.  Only difference is Transaction COA and Accounting COA is changed, as we have new COA structure.

Issue : 

1.) At the time of copy of old ADRs and JLDs, Transaction COA and Accounting COA are grayed out and it has value of old COA structure.  We are not able to change these values for new SLAM.  Is this standard functionality?