Different reserve for encumbrance account is not getting defaulted for different business units.

There are 5 Business Units linked to my Primary ledger, and so reserve for encumbrance account will be different for different Business Units based on the location (Segment 2 of the Chart of Accounts), but the current behaviour of the system is that it is allowing me to put only one account code combinations for reserve for encumbrance account.

Please provide the solution at the earliest.