Sumif Function In Pivot Calculated Field?

I'm getting an error message in when I attempt to create a pivot table calculated field formula using the SUMIF function. My questions are (A) Can SUMIF be used in a pivot table calculated field and (B) If Yes, then why am I getting an error message? To expand more on my second question(B). My scenerio is as follows.

I need to compute the Total Inventory Value (Quantity X Cost) of all our inventory that is aged over 60 days. I have a "Total Value" field that gives me the inventory value at a sku level. also have a "Days Since Last Receipt" (DSLR) field that gives the Days since the Inventory was last Received at a sku level. For Example:

SKU A --Total Value=$100 -- DSLR=50
SKU B --Total Value=$75 -- DSLR =70
SKU C --Total Value=$40 -- DSLR =80

Using the above scenerio and example I tried to execute this calculated field formula: =SUMIF(DSLR,">60",Total Value). However I get an formula error message.