Define Ledger Group in New GL (Leading /Non Leading Ledger)

Hi

I have taken one Leading ledger and another Non Leading Ledger.

Path:

IMG  Financial Accounting (New)  Financial Accounting Global Settings

(New)  Ledgers  Ledger  Define Ledger Group

For the purpose of "Define Ledger Group" Which Ledger Should I tick in Representative Field Leading Ledger or non Leading Ledger or both?

I tried to select/tick Leading Ledger first and then save. After saving- "Go Back" then deselect Non Leading Ledger and tried to save so below error message showed:

"Select One Representative ledger for a ledger group"

So what should I do?

Thanks