BPC 10 ACCOUNT Dimension ACCTYPE=INC and EXP Question

Hi Friends,

I have a question on Account Dimensions Property ACCTYPE = INC or EXP. Below is my scenario.

I have list of accounts in my Account Dimension and I have marked ACCTYPE = INC for Income Accounts and ACCTYPE = EXP for expenses accounts. But Income accounts showing "-" in reports. why is that so?

BPC 10 Report: Exmaple:

                              Jan    Feb    Mar

Income Account      -100   -200  -300

Expense Account     50      70     80

And What should be the Account type for hierarchy for Adding Income accounts + Expenses Accounts = PL account?

Thank you in Advance.