Ability to use P&L Accounts with Department and Balance Sheet Accounts without Department with CVR

Hi There,  

Under Account Defaults of Manage Asset Books of Fixed Assets we have Balance Sheet accounts and P&L Accounts defined. But as per our current cross validation rules, Balance Sheet Accounts should NOT have any departments, and P&L Accounts should have Departments tagged to them in the code combinations.

If I define Account default without 'Department', I'm unable to process P&L accounts which derives the other segments from Account Defaults.

How do we handle this situation. Please advise. Also, find the attachment for reference. Accounts highlighted are Balance Sheet accounts and Accounts without highlight are P&L Accounts.