Analytics Dashboard CASE Error

Heyo,

Working on a dashboard, using a pivot chart, to identify when a ticket is transferred to a different recipient.

I'm using this CASE statement. 

CASE
WHEN [Constituent ID] = [Recipient Constituent ID] THEN 1
ELSE 2
END

Getting this error:

expecting parameter type 'Boolean' that consists of expression type 'Member Expression'. Instead found 'Demension Expression'.

Any ideas on how I would accomplish this?