Subquery not valid in a cursor?

Hi

From the doc, subqueries are valid inside the FROM and WHERE clause but can someone tell me if this is valid? I get an error at compile time. If it`s not valid, then how should I do this kind of query in PL/SQL ?

Thanks
Syltrem

        Cursor  Open_Order_Cur
        is      Select  ORDER_NUMBER, SALES_ORDER_TYPE,
                        CUSTOMER_REFERENCE, ORDER_DATE, USERNAME,
                        WEIGHT, VOLUME, SOP_ORDER_TOTAL_CURRENCY,
                        STATUS_FLAG,
                        (Select Count(*)
                        From    FINANCE.SALES_ORDER_LINES L
                        Where   L.COMPANY_CODE = H.COMPANY_CODE
                          And   L.DIVISION = H.DIVISION
                          And   L.ORDER_NUMBER = H.ORDER_NUMBER)
                From    FINANCE.SALES_ORDER_HEADERS H
                Where   H.COMPANY_CODE = P_Company
                  And   H.DIVISION = P_Division
                  And   H.CUSTOMER_NUMBER = P_Customer_Id
                  And   H.STATUS_FLAG <> 'C';