DAX Formula using Filter

Hello! I need help on this.

I have this matrix table. I have to get the difference confirmed invoices minus the invoices paid. Confirmed and Invoice Paid is a project invoice status under this field "invoicedetail[projectinvoicestatus]. Tried creating an DAX formula but it doesn't show the correct matrix that I want. 
Outstanding Balance =
VAR _invoicepaid =
CALCULATE(
SUM('invoicedetail'[Amount]),
'invoicedetail'[invoice.msdyn_projectinvoicestatusname]
IN { "Invoice Paid" }
)
VAR _confirmed =
CALCULATE(
SUM('invoicedetail'[Amount]),
invoicedetail[invoice.msdyn_projectinvoicestatusname]
IN {"Confirmed"}
)
RETURN
_confirmed - _invoicepaid

I only want to show in the matrix the Confirmed Amount, Invoice Paid Amount and the Outstanding Balance.

Hope you could help me ont his.

Thank you in advance.