Upside Down Chart of Accounts

My client has a Chart of Accounts defined with the P&L first in the account range and the Balance Sheet following that. Currently they use financials and job costing to a limited degree. They are now looking to embark on using more of the software such as Sales, Purchasing, Inventory, Engineer to Order, Contract Billing etc.

I wanted ascertain whether there are any known problems with this configuration. I believe this would impact Fixed Assets Cost Summary Inquiry via the AT AAI's.

Any experiences would be appreciated.

Gavin