I'm trying to write a summary of the total time on the slips Slip Quantity @ Slip Rate/Price (only 1 rate so should be simple).

I found this to use:
parent.parent.parent.parent.parent.parent.reportData.object.billableSlips.@sum.quantity

but it yields and error Error[<BITimeSlip 0x51f5660> valueForUndefinedKey:]: this class is not key value coding-compliant for the kwy quantity. during data extraction for text area: TSTotal string content: Total Fees: @

Any help would be appreciated.

Steve, where are you using this keypath? Are there the right number of parent.parent... etc.?