Sumifs question

Failry new to Smartsheet, I can do this so easily in Excel, but not in Smartsheet. 

I'm basically trying to add an amount requested based on whether or not the request was approved. The approval is a dropdown menu with only 3 text status - Submitted, Declined, Approved. I want to add the Request Amount column and only the values that are approved. 

I've been reading a bunch of posts here, but I cannot get this to work. This is what I have so far. 

=SUMIFS([Requested Amount]:[Requested Amount], Approval:Approval, "Approved")

But all I get is #UNPARSEABLE

hELP!