Very Slow Query with CTE inner join

I created a single query:

WITH RCTE AS
(
    SELECT  ParentChargeId, s.ChargeID, 1 AS Lvl, ISNULL(TotalAmount, 0) as TotalAmount,  ISNULL(s.TaxAmount, 0) as TaxAmount,  
        ISNULL(s.DiscountAmount, 0) as DiscountAmount, s.CustomerID, c.ChargeID as MasterChargeID
        from tblCharge c inner join tblChargeShare s
        on c.ChargeID = s.ChargeID Where s.ChargeShareStatusID < 3 and ParentChargeID is NULL

    UNION ALL

    SELECT c.ParentChargeID, c.ChargeID, Lvl+1 AS Lvl, ISNULL(s.TotalAmount, 0),  ISNULL(s.TaxAmount, 0),  ISNULL(s.DiscountAmount, 0) , s.CustomerID 
        , rc.MasterChargeID 
    from tblCharge c inner join tblChargeShare s
        on c.ChargeID = s.ChargeID
    INNER JOIN RCTE rc ON c.PArentChargeID = rc.ChargeID and s.CustomerID = rc.CustomerID  Where s.ChargeShareStatusID < 3 
)

Select MasterChargeID as ChargeID, rcte.CustomerID, Sum(rcte.TotalAmount) as TotalCharged, Sum(rcte.TaxAmount) as TotalTax, Sum(rcte.DiscountAmount) as TotalDiscount
from RCTE inner join tblChargeShare s on rcte.ChargeID = s.ChargeID and RCTE.CustomerID = s.CustomerID 
Where InvoiceID = 1045854
Group by MasterChargeID, rcte.CustomerID 
GO

It still has the same problem. I select on InvoiceID and it is 2-3 minutes to execute. Select on ChargeID and it is instant. Tuning advisor offers no improvement options - what should I index this view on?