We have some item groups and the executives want to total revenue of the items and then a unit count as well.  Item groups are funky, so I wanted to have a column that sums a specific sku (part of the item group) as ONE unit sold and have a total revenue column next to it.  I am running into problems in that I cannot get the formula to sum the quantity when I put a specific item number requirement on it.  I can sum quantity without this "case when" on just the quantity or I can run it and change the quantity to a text formula with a static result and it works, but for some reason, I cannot get this to fire and instead get an error.  Any ideas on how I might do this?   It will make dashboards much easier for me to make if I can have separate columns for  the sum/quantity of just skus I want to highlight side by side.
Neither of these options are working for me.  
thanks for your help! 
Case when {item} = '971-0009' then Sum({Quantity}) else '0' END
			Case when {item} = '971-0009' then {quantity} else '0' END
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