Sub Ledger Accounting Methods for Primary and Secondary Ledgers (different COA structures)

Hi

My set up involves multiple ledgers with UK COA, each with a custom subledger accounting method (SLAM) consisting of various custom Journal Line Definitions.

I am now setting up a new primary ledger with DE COA, with a secondary ledger of UK COA. I have completed Chart of Accounts mapping using segment rules between DE COA and UK COA.

What is best practice for assigning a custom SLAM to both primary and secondary ledger which have different COAs? It doesn't appear to be possible to assign the same SLAM to both ledgers unless I leave Transaction and Accounting Chart of Accounts blank on the definitions, but if I do this then I can't assign Account Derivation Rules with constant values.