"Calculated Item" option GRAYED OUT on pivot table calculations section

[tbucki1]

I am trying to insert a calculated item on my pivot table that calculates the Profit margin. I have two columns Revenue and Expense. The calculated column would look like this = (Revenue-Expense)/Revenue. However no matter where I click in the pivot table both the Calculated Field and Calculated Items options are grayed out within the "Fields, Items, & Sets" section. Below is a simple view of what my data looks like

Month Revenue Expense Profit Margin(Calculated Item)
9/1/2015 100 20 =(100-20)/100
10/1/2015 80 30 =(80-30)/80
11/1/2015 90 15 =(90-15)/90

How do I insert this calculated column?

Thanks!

 

[Chrisdontm]

All I can think of is that your calculations are set on manual...

Go to the Formula tab, over to the far right section look for " Calculation Options ",

click the drop down and see if it is set on manual, just put it back on Automatic...

I had a sheet that kept changing back for some reason before at work...

 

[tbucki1]

I took a look, but it was already set to "Automatic". Calculated Field and Calculated Item options still grayed out.

Here is my Excel File Attachment. You will see the options grayed out.
November Revenue.xlsx